View source for Module:Params/doc

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The <syntaxhighlight lang="wikitext" inline>{{#invoke:params}}</syntaxhighlight> module is designed to be adopted by those templates that want to have a deep control of their parameters. It is particularly useful to [[variadic template]]s, to which it offers the possibility to count, list, map and propagate the parameters received without knowing their number in advance.

The module offers elegant shortcuts to non variadic templates as well. Outside templates it has virtually no applications; hence, if you plan to make experiments, make sure to do them from within a template, or you will not be able to see much (you can use {{tl|Template sandbox}} for that). Under {{rel|Module:Params/testcases}} you can find helper templates that can be specifically used for testing the module's capabilities in flexible ways (see in particular the &#123;&#123;{{rel|Module:Params/testcases/tmulti}}&#125;&#125; template). Finally, under {{rel|Module:Params/doc/examples}} you can find some of the examples shown in this documentation page.

{{A note}} In case your template uses this module, please add {{tji|lua|Module&#58;Params}} to its documentation page, so that if breaking changes will be introduced in the future the template will be easily traceable without performing <span class="plainlinks">[//en.wikipedia.org/w/index.php?search=insource%3A%2Finvoke%3Aparams%2F&title=Special%3ASearch&profile=advanced&fulltext=1&ns10=1&limit=500 an “in source” search]</span>.

== General usage ==
Among the possibilities that the module offers there is that of performing a series of actions after novel arguments have been concatenated to templates' incoming parameters. As this makes it necessary to keep the argument slots clean from interference, instead of named arguments in order to specify options this module uses ''piping functions'' (i.e. functions that expect to be [[Pipeline (software)|piped]] instead of returning to the caller), or ''modifiers''. This creates a syntax similar to the following example:

<syntaxhighlight lang="wikitext">{{#invoke:params|[modifier]|[...]|[modifier]|[...]|function|[...]}}</syntaxhighlight>

For instance, as the name suggests, the <code>[[#list|list]]</code> function lists the parameters wherewith a template was called. By default it does not add delimiters, but returns an indistinct blob of text in which keys and values are sticked to each other. However, by using the <code>[[#setting|setting]]</code> modifier, we are able to declare a key-value delimiter (<code>p</code>) and an iteration delimiter (<code>i</code>). And so, if we imagined a template named <syntaxhighlight lang="wikitext" inline>{{example template}}</syntaxhighlight> containing the following wikitext,

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|i/p|<br />|: |list}}</syntaxhighlight>

and such template were called with the following arguments,

{{tj|example template|Beast of Bodmin: A large feline inhabiting Bodmin Moor
  |Morgawr: A sea serpent|Owlman: A giant owl-like creature}}

the following result would be produced:

: Beast of Bodmin: A large feline inhabiting Bodmin Moor<br />Morgawr: A sea serpent<br />Owlman: A giant owl-like creature

We can also do more sophisticated things; for instance, by exploiting the possibility to set a header (<code>h</code>) and a footer (<code>f</code>), we can transform the previous code into a generator of [https://html.spec.whatwg.org/multipage/grouping-content.html#the-dl-element definition lists],

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|h/p/i/f|<dl><dt>|</dt><dd>|</dd><dt>|</dd></dl>|list}}</syntaxhighlight>

thus yielding:

:; Beast of Bodmin
:: A large feline inhabiting Bodmin Moor
:; Morgawr
:: A sea serpent
:; Owlman
:: A giant owl-like creature

By placing the <code>[[#with_name_matching|with_name_matching]]</code> modifier before the <code>[[#list|list]]</code> function we will be able to filter some parameters out – such as, for instance, all parameter names that do not end with an “n”:

<syntaxhighlight lang="wikitext">{{#invoke:params|with_name_matching|n$|setting|h/p/i/f|<dl><dt>|</dt><dd>|</dd><dt>|</dd></dl>|list}}</syntaxhighlight>

Thus, the previous code will produce:

:; Beast of Bodmin
:: A large feline inhabiting Bodmin Moor
:; Owlman
:: A giant owl-like creature

This mechanism has the intrinsic advantage that it allows to concatenate infinite modifiers. And so, in order to get the accurate result that we want to obtain we could write:

<syntaxhighlight lang="wikitext">{{#invoke:params|non-sequential|with_name_matching|^B|with_name_matching|n$|with_value_matching|feline|setting|h/p/i/f|<dl><dt>|</dt><dd>|</dd><dt>|</dd></dl>|list}}</syntaxhighlight>

The two modifiers <code>[[#sequential|sequential]]</code> and <code>[[#non-sequential|non-sequential]]</code> refer to a technical jargon used in wikitext: given a parameter list, the subgroup of sequential parameters is constituted by the largest group of consecutive numerical parameters starting from {{tjp|1:}} – this is known as the parameters' “sequence”. A parameter list that does not have a first parameter specified does not possess a sequence.

== Functions ==

Here follows the list of functions. You might want to see also [[#Modifiers (piping functions)|§ Modifiers]].

{{vpad}}

=== <code>self</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>self</code> <span style="nowrap">({{module:params/doc/link to the code|self|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label3 = Not affected by | data3 = Any modifier
| header4 = See also
| data5 = <code>&#123;&#123;[[:mw:Help:Magic words#FULLPAGENAME|FULLPAGENAME]]&#125;&#125;</code>
}}

; Brief
: ''Return the name of the current template''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|self}}</syntaxhighlight>

This argumentless function guarantees that the name of the template invoking this module is shown, regardless if this is transcluded or not.

As a possible example, if a Wikipedia page named <code>Page X</code> contained only a transclusion of a template named <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight>, and the latter contained the following wikitext,

<syntaxhighlight lang="wikitext">{{#invoke:params|self}}

{{FULLPAGENAME}}</syntaxhighlight>

if we visited <code>Template:Foobar</code> we would see,

<pre>Template:Foobar

Template:Foobar</pre>

whereas if we visited <code>Page X</code> we would see:

<pre>Template:Foobar

Page X</pre>

Therefore by writing

<syntaxhighlight lang="wikitext">{{#ifeq:{{#invoke:params|self}}|{{FULLPAGENAME}}
	|Page is not being transcluded
	|Page is being transcluded
}}</syntaxhighlight>

it is possible to understand whether a page is being transcluded or not. For most cases the {{tag|includeonly}} and {{tag|noinclude}} will offer a simpler solution, however there can be cases in which this becomes the way to go.

If <code>Page X</code> transcluded <syntaxhighlight lang="wikitext" inline>{{foobar 2}}</syntaxhighlight> and the latter were a redirect to <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight>, we would still see

<pre>Template:Foobar

Page X</pre>

A typical use case of this function is that of providing stable links for editing transcluded templates. E.g.:

<syntaxhighlight lang="wikitext">{{edit|{{#invoke:params|self}}|edit this template}}</syntaxhighlight>

Another possible use case is that of transcluding a subtemplate. E.g.:

<syntaxhighlight lang="wikitext">{{{{#invoke:params|self}}/my subtemplate|foo|bar}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>count</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>count</code> <span style="nowrap">({{module:params/doc/link to the code|count|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Often preceeded by | data2 = <code>[[#sequential|sequential]]</code>
| label3 = Not affected by | data3 = <code>[[#all_sorted|all_sorted]]</code>, <code>[[#setting|setting]]</code>,<br /><code>[[#sorting_sequential_values|sorting_sequential_val…]]</code>,<br /><code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>
| header4 = See also
| data5 = {{mlx|ParameterCount|}}
}}

; Brief
: ''Count the number of parameters wherewith a template was called''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|count}}</syntaxhighlight>

This function does not take arguments.

The number that this function yields depends on the modifiers that precede it. For instance, in a template that is called with both named and unnamed arguments,

<syntaxhighlight lang="wikitext" inline>{{#invoke:params|count}}</syntaxhighlight>

and

<syntaxhighlight lang="wikitext" inline>{{#invoke:params|sequential|count}}</syntaxhighlight>

will return different results.

{{vpad|1.5em}}

=== <code>concat_and_call</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>concat_and_call</code> <span style="nowrap">({{module:params/doc/link to the code|concat_and_call|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Not affected by | data2 = <code>[[#all_sorted|all_sorted]]</code>
| header3 = See also
| data4 = <code>[[#concat_and_invoke|concat_and_invoke]]</code>, <code>[[#concat_and_magic|concat_and_magic]]</code>
}}

; Brief
: ''Prepend positive numerical arguments to the current parameters, or impose non-numerical or negative numerical arguments, then propagate everything to a custom template''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|concat_and_call|template name|[prepend 1]|[prepend 2]|[...]|[prepend n]|[named item 1=value 1]|[...]|[named item n=value n]|[...]}}</syntaxhighlight>

For example, if our <syntaxhighlight lang="wikitext" inline>{{example template}}</syntaxhighlight> had the following code,

<syntaxhighlight lang="wikitext">{{#invoke:params|concat_and_call|foobar|elbow|earth|room|7=classy|hello=not today}}</syntaxhighlight>

and were called with,

{{tj|example template|one|two|three|hello: world|wind: spicy}}

the following call to the <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight> template would be performed:

{{tj|foobar|elbow|earth|room|7: classy|8: one|9: two|10: three
  |wind: spicy|hello: not today}}

By using the <code>[[#cutting|cutting]]</code> modifier it is possible to impose numerical positive parameters instead of prepending them. For instance, the following code echoes all incoming parameters to <syntaxhighlight lang="wikitext" inline>{{my template}}</syntaxhighlight>, with the exception of {{para|3}}, which is replaced with <code>hello world</code>:

<syntaxhighlight lang="wikitext">{{#invoke:params|cutting|3|0|concat_and_call|my template|{{{1|}}}|{{{2|}}}|hello world}}</syntaxhighlight>

If the numerical parameters to replace are a limited number, as in the example above, a better alternative might be that of using <code>[[#imposing|imposing]]</code>.

If no other argument besides the template name are provided this function simply echoes the current parameters to another template.

{{vpad}}

{{A note}} All arguments passed to this function except the template name will not be trimmed of their leading and trailing spaces. The <code>concat_and_call</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>concat_and_invoke</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>concat_and_invoke</code> <span style="nowrap">({{module:params/doc/link to the code|concat_and_invoke|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Not affected by | data2 = <code>[[#all_sorted|all_sorted]]</code>
| header3 = See also
| data4 = <code>[[#concat_and_call|concat_and_call]]</code>, <code>[[#concat_and_magic|concat_and_magic]]</code>
}}

; Brief
: ''Prepend positive numerical arguments to the current parameters, or impose non-numerical or negative numerical arguments, then propagate everything to a custom module''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|concat_and_invoke|module name|function name|[prepend 1]|[prepend 2]|[...]|[prepend n]|[named item 1=value 1]|[...]|[named item n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#concat_and_call|concat_and_call]]</code>, but invokes a module instead of calling a template.

{{vpad}}

{{A note}} All arguments passed to this function except the module name and the function name will not be trimmed of their leading and trailing spaces. The <code>concat_and_invoke</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>concat_and_magic</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>concat_and_magic</code> <span style="nowrap">({{module:params/doc/link to the code|concat_and_magic|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Not affected by | data2 = <code>[[#all_sorted|all_sorted]]</code>
| header3 = See also
| data4 = <code>[[#concat_and_call|concat_and_call]]</code>, <code>[[#concat_and_invoke|concat_and_invoke]]</code>
}}

; Brief
: ''Prepend positive numerical arguments to the current parameters, or impose non-numerical or negative numerical arguments, then propagate everything to a custom parser function''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|concat_and_magic|parser function|[prepend 1]|[prepend 2]|[...]|[prepend n]|[named item 1=value 1]|[...]|[named item n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#concat_and_call|concat_and_call]]</code>, but calls a [[:mw:Help:Magic words#Parser functions|parser function]] instead of a template.

{{vpad}}

{{A note}} All arguments passed to this function except the magic word will not be trimmed of their leading and trailing spaces. The <code>concat_and_magic</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>value_of</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>value_of</code> <span style="nowrap">({{module:params/doc/link to the code|value_of|code}})</span>
| label1 = Num. of arguments | data1 = 1
| label2 = Relevant [[#setting|runtime variables]] | data2 = <code>h</code>, <code>f</code>, <code>n</code>
| label3 = Not affected by | data3 = <code>[[#all_sorted|all_sorted]]</code>
| header4 = See also
| data5 = <code>[[#list_values|list_values]]</code>
}}

; Brief
: ''Get the value of a single parameter''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|value_of|parameter name}}</syntaxhighlight>

Without modifiers this function is similar to writing <syntaxhighlight lang="wikitext" inline>{{{parameter name|}}}</syntaxhighlight>. With modifiers, however, it allows to reach parameters that would be unreachable without knowing their number in advance. For instance, writing

<syntaxhighlight lang="wikitext">{{#invoke:params|cutting|-2|0|value_of|1}}</syntaxhighlight>

will expand to the value of the second-last sequential parameter, independently of how many parameters the template was called with. If no matching parameter is found this function expands to nothing. A header (<code>h</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via the <code>[[#setting|setting]]</code> modifier – the strings assigned to the key-value pair delimiter (<code>p</code>), the iteration delimiter (<code>i</code>) and the last iteration delimiter (<code>l</code>) will be ignored.

For instance, the {{Tl|If then show}} template could be rewritten as

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_not_matching|^%s*$|setting|h/f/n|{{{3|}}}|{{{4|}}}|{{{2|}}}|value_of|1}}</syntaxhighlight>

Simplifying, the following wikitext expands to the first parameter that is not empty:

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_not_matching||strict|squeezing|value_of|1}}</syntaxhighlight>

Whereas the following wikitext expands to the first parameter that is not blank (i.e. neither empty nor containing only [[whitespace]]s)

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_not_matching|^%s*$|squeezing|value_of|1}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>list</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>list</code> <span style="nowrap">({{module:params/doc/link to the code|list|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Relevant [[#setting|runtime variables]] | data3 = <code>h</code>, <code>p</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header4 = See also
| data5 = <code>[[#list_values|list_values]]</code>
}}

; Brief
: ''List the template parameters (both their names and their values)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|list}}</syntaxhighlight>

This function does not take arguments.

If the <code>[[#setting|setting]]</code> modifier was not placed earlier, this function will not add delimiters, but will return an indistinct blob of text in which keys and values are sticked to each other. A header (<code>h</code>), a key-value pair delimiter (<code>p</code>), an iteration delimiter (<code>i</code>), a last iteration delimiter (<code>l</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via <code>[[#setting|setting]]</code>.

For example, the following code

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|h/i/p/f/n|'''Parameters passed:''' |); | (|)|'''No parameters were passed'''|list}}</syntaxhighlight>

will generate an output similar to the following.

: '''Parameters passed:''' Owlman (A giant owl-like creature); Beast of Bodmin (A large feline inhabiting Bodmin Moor); Morgawr (A sea serpent)

{{vpad|1.5em}}

=== <code>list_values</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>list_values</code> <span style="nowrap">({{module:params/doc/link to the code|list_values|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Often preceeded by | data3 = <code>[[#sequential|sequential]]</code>
| label4 = Relevant [[#setting|runtime variables]] | data4 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header5 = See also
| data6 = <code>[[#list|list]]</code>, <code>[[#value_of|value_of]]</code>, {{mlx|separated entries|}}
}}

; Brief
: ''List the values of the incoming parameters''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|list_values}}</syntaxhighlight>

This function does not take arguments.

The <code>[[#sequential|sequential]]</code> modifier often accompanies this function. If the <code>[[#setting|setting]]</code> modifier was not placed earlier, this function will not add delimiters, but will return an indistinct blob of text in which values are sticked to each other. A header (<code>h</code>), an iteration delimiter (<code>i</code>), a last iteration delimiter (<code>l</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via <code>[[#setting|setting]]</code> – the string assigned to the key-value pair delimiter (<code>p</code>) will be ignored.

For example, the following code

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|h/i/p/f/n|'''Parameters passed:''' |); | (|)|'''No parameters were passed'''|list_values}}</syntaxhighlight>

will generate an output similar to the following.

: '''Values of parameters passed:''' A giant owl-like creature; A large feline inhabiting Bodmin Moor; A sea serpent.

{{vpad|1.5em}}

=== <code>call_for_each</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>call_for_each</code> <span style="nowrap">({{module:params/doc/link to the code|call_for_each|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Relevant [[#setting|runtime variables]] | data3 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header4 = See also
| data5 = <code>[[#call_for_each_value|call_for_each_value]]</code>, <code>[[#invoke_for_each|invoke_for_each]]</code>, <code>[[#magic_for_each|magic_for_each]]</code>, <code>[[#call_for_each_group|call_for_each_group]]</code>, {{mlx|for loop|}}, {{tl2|for loop}}
}}

; Brief
: ''For each parameter passed to the current template, call a custom template with at least two parameters (key and value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|call_for_each|template name|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]
}}</syntaxhighlight>

Some functions are like shortcuts. The <code>X_for_each|F</code> functions are similar to <code>mapping_by_X(ing)|F|(names_and_values|)list_values</code>. The latter syntax (i.e. the modifier version) allows a <code>values_and_names</code> flag to invert the order from key-value to value-key.

All unnamed arguments following the template name will be placed after the key-value pair. Named arguments will be passed verbatim. A header (<code>h</code>), an iteration delimiter (<code>i</code>), a last iteration delimiter (<code>l</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via the <code>[[#setting|setting]]</code> modifier – the string assigned to the key-value pair delimiter (<code>p</code>) will be ignored.

Calling a template for each key-value pair with

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|call_for_each|foobar}}</syntaxhighlight>

will be different from writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|for_each|{{foobar|$#|$@}}}}</syntaxhighlight>

In the first example each key-value pair will be passed to the <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight> template, while in the second example the <code>$#</code> and <code>$@</code> tokens will be expanded ''after'' the <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight> template has been called. In most cases this will make no difference, however there are several situations where it will lead to nonsensical results.

{{vpad}}

{{A note}} All arguments passed to this function except the template name will not be trimmed of their leading and trailing spaces. The <code>call_for_each</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>invoke_for_each</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>invoke_for_each</code> <span style="nowrap">({{module:params/doc/link to the code|invoke_for_each|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Relevant [[#setting|runtime variables]] | data3 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header4 = See also
| data5 = <code>[[#invoke_for_each_value|invoke_for_each_value]]</code>, <code>[[#call_for_each|call_for_each]]</code>, <code>[[#magic_for_each|magic_for_each]]</code>
}}

; Brief
: ''For each parameter passed to the current template, invoke a custom module function with at least two arguments (key and value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|invoke_for_each|module name|module function|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#call_for_each|call_for_each]]</code>, but invokes a module instead of calling a template.

Invoking a module function for each key-value pair with

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|invoke_for_each|foobar|main}}</syntaxhighlight>

will be different from writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|for_each|{{#invoke:foobar|main|$#|$@}}}}</syntaxhighlight>

In the first example each key-value pair will be passed to the <syntaxhighlight lang="wikitext" inline>{{#invoke:foobar|main}}</syntaxhighlight> module function, while in the second example the <code>$#</code> and <code>$@</code> tokens will be expanded ''after'' the module function has been invoked. There might be cases in which this will make no difference, however there are several situations where it will lead to nonsensical results.

{{vpad}}

{{A note}} All arguments passed to this function except the module name and the function name will not be trimmed of their leading and trailing spaces. The <code>invoke_for_each</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>magic_for_each</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>magic_for_each</code> <span style="nowrap">({{module:params/doc/link to the code|magic_for_each|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Relevant [[#setting|runtime variables]] | data3 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header4 = See also
| data5 = <code>[[#magic_for_each_value|magic_for_each_value]]</code>, <code>[[#call_for_each|call_for_each]]</code>, <code>[[#invoke_for_each|invoke_for_each]]</code>
}}

; Brief
: ''For each parameter passed to the current template, call a magic word with at least two arguments (key and value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|magic_for_each|parser function|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#call_for_each|call_for_each]]</code>, but calls a [[:mw:Help:Magic words#Parser functions|parser function]] instead of a template.

{{vpad}}

{{A note}} All arguments passed to this function except the magic word will not be trimmed of their leading and trailing spaces. The <code>magic_for_each</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>call_for_each_value</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>call_for_each_value</code> <span style="nowrap">({{module:params/doc/link to the code|call_for_each_value|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Often preceeded by | data3 = <code>[[#sequential|sequential]]</code>
| label4 = Relevant [[#setting|runtime variables]] | data4 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header5 = See also
| data6 = <code>[[#call_for_each|call_for_each]]</code>, <code>[[#invoke_for_each_value|invoke_for_each_value]]</code>, <code>[[#magic_for_each_value|magic_for_each_value]]</code>, <code>[[#call_for_each_group|call_for_each_group]]</code>, {{mlx|for loop|}}, {{tl2|for loop}}
}}

; Brief
: ''For each parameter passed to the current template, call a custom template with at least one parameter (i.e. the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|call_for_each_value|template name|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]}}</syntaxhighlight>

The <code>[[#sequential|sequential]]</code> modifier often accompanies this function. All unnamed arguments following the template name will be appended after the value parameter. Named arguments will be passed verbatim. A header (<code>h</code>), an iteration delimiter (<code>i</code>), a last iteration delimiter (<code>l</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via the <code>[[#setting|setting]]</code> modifier – the string assigned to the key-value pair delimiter (<code>p</code>) will be ignored.

For example, calling {{tl|tl}} with each parameter can be done by writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|setting|i|, |call_for_each_value|tl}}</syntaxhighlight>

This will be different from writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|setting|i|, |for_each|{{tl|$@}}}}</syntaxhighlight>

In the first example each value will be passed to the {{tl|tl}} template, while in the second example the <code>$@</code> token will be expanded ''after'' the {{tl|tl}} template has been called. Here this will make no difference, however there are several situations where it will lead to nonsensical results.

{{vpad}}

{{A note}} All arguments passed to this function except the template name will not be trimmed of their leading and trailing spaces. The <code>call_for_each_value</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>invoke_for_each_value</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>invoke_for_each_value</code> <span style="nowrap">({{module:params/doc/link to the code|invoke_for_each_value|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Often preceeded by | data3 = <code>[[#sequential|sequential]]</code>
| label4 = Relevant [[#setting|runtime variables]] | data4 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header5 = See also
| data6 = <code>[[#call_for_each_value|call_for_each_value]]</code>, <code>[[#invoke_for_each|invoke_for_each]]</code>, <code>[[#magic_for_each_value|magic_for_each_value]]</code>
}}

; Brief
: ''For each parameter passed to the current template, invoke a custom module function with at least one argument (i.e. the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|invoke_for_each_value|module name|module function|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#call_for_each_value|call_for_each_value]]</code>, but invokes a module instead of calling a template.

Invoking a module function for each value with

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|invoke_for_each_value|foobar|main}}</syntaxhighlight>

will be different from writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|for_each|{{#invoke:foobar|main|$@}}}}</syntaxhighlight>

In the first example each value will be passed to the {{ml|foobar|main}} module function, while in the second example the <code>$@</code> token will be expanded ''after'' the module function has been invoked. There might be cases in which this will make no difference, however there are several situations where it will lead to nonsensical results.

{{vpad}}

{{A note}} All arguments passed to this function except the module name and the function name will not be trimmed of their leading and trailing spaces. The <code>invoke_for_each_value</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>magic_for_each_value</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>magic_for_each_value</code> <span style="nowrap">({{module:params/doc/link to the code|magic_for_each_value|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Often preceeded by | data3 = <code>[[#sequential|sequential]]</code>
| label4 = Relevant [[#setting|runtime variables]] | data4 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header5 = See also
| data6 = <code>[[#call_for_each_value|call_for_each_value]]</code>, <code>[[#invoke_for_each_value|invoke_for_each_value]]</code>, <code>[[#magic_for_each|magic_for_each]]</code>
}}

; Brief
: ''For each parameter passed to the current template, call a magic word with at least one argument (i.e. the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|magic_for_each_value|parser function|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]}}</syntaxhighlight>

Exactly like <code>[[#call_for_each_value|call_for_each_value]]</code>, but calls a [[:mw:Help:Magic words#Parser functions|parser function]] instead of a template.

For example, if a template had the following code,

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|setting|ih|&preloadparams%5b%5d{{=}}|magic_for_each_value|urlencode|QUERY}}</syntaxhighlight>

and were transcluded as <syntaxhighlight lang="wikitext" inline>{{example template|hello world|àèìòù|foobar}}</syntaxhighlight>, the <code><nowiki>{{</nowiki>[[:mw:Help:Magic words#URL data|urlencode]]:...|QUERY<nowiki>}}</nowiki></code> parser function would be called for each incoming parameter as first argument and with <code>QUERY</code> as second argument, and finally the returned text would be prefixed with <code>&preloadparams%5b%5d=</code>. This would generate,

<pre>&preloadparams%5b%5d=hello+world&preloadparams%5b%5d=%C3%A0%C3%A8%C3%AC%C3%B2%C3%B9&preloadparams%5b%5d=foo+bar</pre>

which can be used to allow the creation of pages [[:mw:Manual:Creating pages with preloaded text#Using parameters|with preloaded text and parameters]].

{{vpad}}

{{A note}} All arguments passed to this function except the magic word will not be trimmed of their leading and trailing spaces. The <code>magic_for_each_value</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>call_for_each_group</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>call_for_each_group</code> <span style="nowrap">({{module:params/doc/link to the code|call_for_each_group|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Often preceeded by | data2 = <code>[[#all_sorted|all_sorted]]</code>
| label3 = [[#sequential|Sortable]] | data3 = Yes
| label4 = Relevant [[#setting|runtime variables]] | data4 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header5 = See also
| data6 = <code>[[#call_for_each|call_for_each]]</code>, <code>[[#call_for_each_value|call_for_each_value]]</code>, {{mlx|for loop|}}, {{tl2|for loop}}
}}

; Brief
: ''Call a custom template for each group of parameters that have the same numerical suffix''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|call_for_each_value|template name|[append 1]|[append 2]|[...]|[append n]|[named param 1=value 1]|[...]|[named param n=value n]|[...]
}}</syntaxhighlight>

The custom template will be repeatedly called with the numerical id of the group (i.e. the numerical suffix) as '''argument zero''' (i.e. {{param|0}}). This will be an empty string for the group of incoming parameters that do not have a numerical suffix. A hyphen before the numerical suffix will be interpreted as a minus sign (and therefore the group id will be treated as a negative number). Numerical incoming parameters will be treated as if their prefix is an empty string (these can be captured using <code>&#123;&#123;&#123;&#125;&#125;&#125;</code> or <code>&#123;&#123;&#123;&#124;''fallback text''&#125;&#125;&#125;</code> in the callback template). Spaces between the prefix and the numerical suffix will be ignored (therefore writing {{para|foobar123}} will be identical to writing {{para|foobar&nbsp;123}} – in case of collisions one of the two values will be discarded). In the unlikely scenario that the prefix is itself a number (e.g. {{para|1 1}}, {{para|2 1}}, etc.), if this is <code>0</code> or a negative number it will be decreased by one unit in order to leave the parameter zero undisturbed (so <code>0</code> will become <code>-1</code>, <code>-1</code> will become <code>-2</code>, and so on – if needed, you can use <code>...|[[#purging|purging]]|0{1|...</code> in the callback template to renormalize these numbers).

All unnamed arguments that follow the template name in the invocation of this module will appear as sequential parameters in each call. Named arguments will be passed verbatim. Both named and unnamed arguments passed to this function will be given precedence in case of collisions. Numerical argument names below <code>1</code> will be decreased by one unit (i.e. <code>...|call_for_each_group&#124;example template&#124;0=Hello world&#124;...</code> will become {{para|-1|Hello world}} in the callback template – see above).

A header (<code>h</code>), an iteration delimiter (<code>i</code>), a last iteration delimiter (<code>l</code>), a footer (<code>f</code>), and a fallback text (<code>n</code>) can be declared via the <code>[[#setting|setting]]</code> modifier – the string assigned to the key-value pair delimiter (<code>p</code>) will be ignored.

If you are a module writer, you might recognize some distant similarities between this function and <code>[[Module:TableTools#affixNums|TableTools.affixNums]]</code>.

For example, if a template named <syntaxhighlight lang="wikitext" inline>{{foobar}}</syntaxhighlight> contained the following code,

<syntaxhighlight lang="wikitext">{{#invoke:params|all_sorted|call_for_each_group|example template|hello|world|foo=bar}}</syntaxhighlight>

writing

<syntaxhighlight lang="wikitext">{{foobar
	| 1 = Lorem
	| 2 = ipsum
	| bicycle-1 = dolor
	| bicycle1 = sit
	| boat1 = amet
	| car2 = consectetur
	| bicycle2 = adipiscing
	| other = elit
	| sunscreen = vestibulum
	| = ultricies
	| foo1 = neque nisl
}}</syntaxhighlight>

will be equivalent to writing

<syntaxhighlight lang="wikitext">{{example template
	| 0 = -1
	| 1 = hello
	| 2 = world
	| bicycle = dolor
	| foo = bar
}}{{example template
	| 0 = 1
	| 1 = hello
	| 2 = world
	| = Lorem
	| bicycle = sit
	| boat = amet
	| foo = bar
}}{{example template
	| 0 = 2
	| 1 = hello
	| 2 = world
	| = ipsum
	| bicycle = adipiscing
	| car = consectetur
	| foo = bar
}}{{example template
	| 0 =
	| 1 = hello
	| 2 = world
	| = ultricies
	| foo = bar
	| other = elit
	| sunscreen = vestibulum
}}</syntaxhighlight>

'''The modifiers <code>[[#sequential|sequential]]</code>, <code>[[#non-sequential|non-sequential]]</code> and <code>[[#all_sorted|all_sorted]]</code> will affect what groups of parameters will be iterated, not what parameters will be grouped.''' Before calling this function you will likely want to reduce the list of parameters via one of the <code>with_*_matching</code> group of modifiers (for instance <code>...|with_name_matching|.%-%d+$|or|[^%-]%d+$|call_for_each_group|...</code> leaves only the parameters in which both the prefix and the numerical suffix are not empty strings). The <code>[[#all_sorted|all_sorted]]</code> modifier often accompanies this function.

{{vpad}}

{{Warnsign}} In writing templates there is often the habit of signaling [[:mw:Help:Substitution#Multilevel substitution|multilevel substitutions]] using the <syntaxhighlight lang="wikitext" inline>{{{|safesubst:}}}</syntaxhighlight> notation. This is a dangerous practice, because <syntaxhighlight lang="wikitext" inline>{{{|safesubst:}}}</syntaxhighlight> means “write the parameter with an empty name, otherwise write <code>safesubst:</code>”. Due to the fact that <code>call_for_each_group</code> '''can pass parameters with an empty name''', a callback template should never use <syntaxhighlight lang="wikitext" inline>{{{|safesubst:}}}</syntaxhighlight> to notate multilevel substitutions, but should use instead <syntaxhighlight lang="wikitext" inline>safesubst:<noinclude /></syntaxhighlight>. Not following this advice can lead to bugs that are hard to debug.

{{vpad}}

At &#123;&#123;{{rel|Module:Params/doc/examples/list of authors}}&#125;&#125; you can find an example of how to use this function to list authors the same way {{tl|Cite book}} does. For instance, writing

<syntaxhighlight lang="wikitext">{{module:params/doc/examples/list of authors
	| last1 = Playfair
	| first1 = I. S. O.
	| author-link1 = Ian Stanley Ord Playfair
	| last2 = Stitt
	| first2 = G. M. S.
	| last3 = Molony
	| first3 = C. J. C.
	| last4 = Toomer
	| first4 = S. E.
}}</syntaxhighlight>

will generate

{{module:params/doc/examples/list of authors
	| last1 = Playfair
	| first1 = I. S. O.
	| author-link1 = Ian Stanley Ord Playfair
	| last2 = Stitt
	| first2 = G. M. S.
	| last3 = Molony
	| first3 = C. J. C.
	| last4 = Toomer
	| first4 = S. E.
}}

On a different note, see also &#123;&#123;{{rel|Module:Params/doc/examples/tablebox}}&#125;&#125; and &#123;&#123;{{rel|Module:Params/doc/examples/informal tablebox}}&#125;&#125; for two examples on how to exploit this function to create [[Template:Infobox|infoboxes]].

{{vpad}}

{{A note}} All arguments passed to this function except the template name will not be trimmed of their leading and trailing spaces. The <code>call_for_each_group</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad|1.5em}}

=== <code>for_each</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Function <code>for_each</code> <span style="nowrap">({{module:params/doc/link to the code|for_each|code}})</span>
| label1 = Num. of arguments | data1 = 1
| label2 = [[#sequential|Sortable]] | data2 = Yes
| label3 = Relevant [[#setting|runtime variables]] | data3 = <code>h</code>, <code>i</code>, <code>l</code>, <code>f</code>, <code>n</code>
| header4 = See also
| data5 = <code>[[#list|list]]</code>, <code>[[#list_values|list_values]]</code>, {{mlx|for nowiki|}}, {{tl2|for nowiki}}
}}

; Brief
: ''For each parameter passed to the current template, expand all occurrences of <code>$#</code> and <code>$@</code> within a given text as key and value respectively''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|for_each|wikitext}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|for_each|Arg name: $#, Arg value: $@}}</syntaxhighlight>

The text returned by this function is not expanded further (currently this module does not offer an <code>expand_for_each</code> function). If you need wikitext expansion, use <code>[[#concat_and_call|concat_and_call]]</code> to propagate the incoming parameters altogether to the {{tl|for nowiki}} template. Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|concat_and_call|for nowiki|[separator]|<nowiki>{{{i}}} is {{urlencode:{{{1}}}|QUERY}}</nowiki>}}</syntaxhighlight>

{{vpad}}

{{A note}} The argument passed to this function will not be trimmed of its leading and trailing spaces. The <code>for_each</code> function name itself, however, will be trimmed of its surrounding spaces.

{{vpad}}

== Modifiers (piping functions) ==
The following are ''modifiers'', i.e. functions that expect to be piped instead of returning to the caller. Each of them can be followed by either another modifier or a non-piping function. The actions that modifiers do are done sequentially, in the same order chosen during the invocation of this module. Some modifiers, however, after signaling their presence to the modifiers that might follow, add their action to the queue of actions that will be done last (e.g. <code>[[#sequential|sequential]]</code>, <code>[[#non-sequential|non-sequential]]</code>, <code>[[#all_sorted|all_sorted]]</code>).

{{vpad}}

=== <code>sequential</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>sequential</code> <span style="nowrap">({{module:params/doc/link to the code|sequential|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = No
| label3 = Conflicts with | data3 = <code>[[#non-sequential|non-sequential]]</code>, <code>[[#all_sorted|all_sorted]]</code>
| header4 = See also
| data5 = <code>[[#non-sequential|non-sequential]]</code>, <code>[[#all_sorted|all_sorted]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>
}}

; Brief
: ''(IN FUNCTIONS ONLY, DOES NOT AFFECT MODIFIERS) Reduce the parameter list to the subgroup of consecutive parameters that follow {{tjp|1:}}''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|sequential|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|count}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Using <code>sequential</code> together with <code>[[#non-sequential|non-sequential]]</code> will generate an error.

{{vpad}}

{{A note}} Like <code>[[#non-sequential|non-sequential]]</code>, the <code>sequential</code> modifier permanently marks a query. For instance, writing <syntaxhighlight lang="wikitext" inline>{{#invoke:params|sequential|with_name_not_matching|1|...}}</syntaxhighlight> will first mark the query as “sequential”, then will discard the first element from the sequence (leaving all the others intact). And so, no matter how many other parameters will be present, nothing will be shown.

{{vpad|1.5em}}

=== <code>non-sequential</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>non-sequential</code> <span style="nowrap">({{module:params/doc/link to the code|non-sequential|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = No
| label3 = Conflicts with | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#all_sorted|all_sorted]]</code>
}}

; Brief
: ''(IN FUNCTIONS ONLY, DOES NOT AFFECT MODIFIERS) Reduce the parameter list by discarding the subgroup of consecutive parameters that follow {{tjp|1:}}''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|non-sequential|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|non-sequential|setting|ih/p|{{!}}|{{=}}|list}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Using <code>non-sequential</code> together with <code>[[#sequential|sequential]]</code> will generate an error.

{{vpad}}

{{A note}} Like <code>[[#sequential|sequential]]</code>, the <code>non-sequential</code> modifier permanently marks a query, and no matter what transformations will follow (see <code>[[#squeezing|squeezing]]</code>) the parameters' “sequence” will not be shown.

{{vpad|1.5em}}

=== <code>all_sorted</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>all_sorted</code> <span style="nowrap">({{module:params/doc/link to the code|all_sorted|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = No
| label3 = Conflicts with | data3 = <code>[[#sequential|sequential]]</code>
| label4 = Has no effects on | data4 = <code>[[#count|count]]</code>, <code>[[#value_of|value_of]]</code>, <code>[[#concat_and_call|concat_and_call]]</code>, <code>[[#concat_and_invoke|concat_and_invoke]]</code>, <code>[[#concat_and_magic|concat_and_magic]]</code>
| header5 = See also
| data6 = [[Natural sort order]], <code>[[#sequential|sequential]]</code>, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''(IN FUNCTIONS ONLY, DOES NOT AFFECT MODIFIERS) When the time will come, all parameters will be dispatched sorted: first the numerical ones, then the rest in [[natural sort order|natural order]]''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|all_sorted|pipe function name}}</syntaxhighlight>

{{A note}} This function sorts the way ''functions'' iterate across ''all'' parameters based on ''their names''. If you want to sort ''sequential parameters'' based on ''their values'', see <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|all_sorted|setting|ih/p|{{!}}|{{=}}|list}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Normally only sequential parameters are dispatched sorted, whereas non-sequential ones are dispatched randomly. The <code>all_sorted</code> modifier ensures that nothing is left out of ([[natural sort order|natural]]) order. Attention must be paid to the fact that parameters whose name is a negative number will appear first. To avoid this the <code>[[#squeezing|squeezing]]</code> modifier can be used.<ref>To be precise, the order will not be strictly alphabetical, because this would imply that a template called with the following parameters <syntaxhighlight lang="wikitext" inline>{{foobar|-4=you|9=wanna|.=me?|11=marry|-8=do}}</syntaxhighlight> would see them reordered as follows: <syntaxhighlight lang="wikitext" inline>{{foobar|-8=do|-4=you|.=me?|9=wanna|11=marry}}</syntaxhighlight> (with the dot in the middle between negative and positive numbers). To avoid this, '''numbers are always displayd first''' (i.e. <syntaxhighlight lang="wikitext" inline>{{foobar|-8=do|-4=you|9=wanna|11=marry|.=me?}}</syntaxhighlight>).</ref>

The <code>all_sorted</code> modifier only affects the way parameters are shown, but has no effects on functions that do not iterate or cannot impose an order, such as:

* <code>[[#count|count]]</code>
* <code>[[#value_of|value_of]]</code>
* <code>[[#concat_and_call|concat_and_call]]</code>
* <code>[[#concat_and_invoke|concat_and_invoke]]</code>
* <code>[[#concat_and_magic|concat_and_magic]]</code>

{{vpad}}

{{A note}} The <code>all_sorted</code> modifier cannot be used with functions that propagate several parameters together in a single call, like <code>[[#concat_and_call|concat_and_call]]</code>, <code>[[#concat_and_invoke|concat_and_invoke]]</code>, and <code>[[#concat_and_magic|concat_and_magic]]</code>, because during a call the order of arguments is always lost. For the same reason, it is not possible to guess the order of named parameters a template was transcluded with.

{{vpad|1.5em}}

=== <code>setting</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>setting</code> <span style="nowrap">({{module:params/doc/link to the code|setting|code}})</span>
| label1 = Num. of arguments | data1 = 2–7 (variable)
| label2 = Repeatable | data2 = Yes
| header3 = Memory slots
| data4 = {{aligned table|fullwidth=y
  | col1header=y | col1style=display:block;
  | <code>p</code>| Key-value delimiter
  | <code>i</code>| Iteration delimiter
  | <code>l</code>| Last iteration delimiter
  | <code>h</code>| Header text
  | <code>f</code>| Footer text
  | <code>n</code>| Fallback text
 }}
}}

; Brief
: ''Define glue strings''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|directives|...|pipe function name}}</syntaxhighlight>

This modifier allows to set some internal variables that will be used by functions. It takes a variable number of arguments, relying on the first argument to understand how many other arguments to read. A few examples will introduce it better than words:

* <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|i|{{!}}|list_values}}</syntaxhighlight>
*: ↳ Set the value of ''iteration delimiter'' to <code>|</code>, then list all values
* <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih|{{!}}|list_values}}</syntaxhighlight>
*: ↳ Set the value of both ''header text'' and ''iteration delimiter'' to <code>|</code>, then list all values
* <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|list}}</syntaxhighlight>
*: ↳ Set the value of both ''header text'' and ''iteration delimiter'' to <code>|</code>, set ''key-value pair delimiter'' to <code>=</code>, then list all parameters
* <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p/n|{{!}}|{{=}}|No parameters were passed|list}}</syntaxhighlight>
*: ↳ Set the value of both ''header text'' and ''iteration delimiter'' to <code>|</code>, set ''key-value pair delimiter'' to <code>=</code>, set ''fallback text'' to <code>No parameters were passed</code>, then list all parameters

The first argument is a slash-separated list of lists of slots to assign; one slot is referred by exactly one character and each list of slots maps exactly one argument. A slot indicates which internal variable to set. If more than one slot is aggregated within the same slash-separated list the same text will be assigned to more than one variable.

The slots available are the following:

{| class="wikitable" style="margin-left: auto; margin-right: auto;"
|-
! Slots
! Variable
! Description
|-
| <code>p</code>
| ''Key-value pair delimiter''
| The string of text that will be placed between each parameter name and its value; it is never inserted by functions that only iterate between values, or by functions that pass the key-value pairs to external calls.
|-
| <code>i</code>
| ''Iteration delimiter''
| The string of text that will be placed between each iteration; it is never inserted unless there are two or more parameters to show when <code>l</code> is not given, or three or more parameters when <code>l</code> is given.
|-
| <code>l</code>
| ''Last iteration delimiter''
| The string of text that will be placed between the second last and the last iteration; it is never inserted unless there are two or more parameters to show; if omitted defaults to <code>i</code>.
|-
| <code>h</code>
| ''Header text''
| The string of text that will be placed before the iteration begins; it is never inserted if there are no parameters to show.
|-
| <code>f</code>
| ''Footer text''
| The string of text that will be placed after the iteration is over; it is never inserted if there are no parameters to show.
|-
| <code>n</code>
| ''Fallback text''
| The string of text that will be placed if there are no parameters to show.
|}

All space characters in the directives arguments are discarded. Therefore writing <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|...}}</syntaxhighlight> is equivalent to writing

<syntaxhighlight lang="wikitext">{{#invoke:params|setting| i
	h	/ p |...}}</syntaxhighlight>

In theory, instead of assigning different slots at once (i.e. <syntaxhighlight lang="wikitext" inline>{{...|setting|ih/p|{{!}}|{{=}}|...}}</syntaxhighlight>), it is possible to write separate invocations of <code>setting</code> for each variable, as in <syntaxhighlight lang="wikitext" inline>{{...|setting|ih|{{!}}|setting|p|{{=}}...}}</syntaxhighlight>. This method however will be slightly less efficient.

Sometimes it might be necessary to make the values assigned depend on conditional expressions. For instance, the following imaginary <syntaxhighlight lang="wikitext" inline>{{Foobar see also}}</syntaxhighlight> template uses the <code>[[:mw:Help:Extension:ParserFunctions##ifexpr|#ifexpr]]</code> parser function to properly show the “and” conjunction and possibly an [[Serial comma|Oxford comma]] when more than two page names are provided:

<syntaxhighlight lang="wikitext">{{Hatnote|{{{altphrase|Foobar see also}}}: {{#if:{{{1|}}}
	|{{#invoke:params|sequential|squeezing|setting|i/l|, |{{#ifexpr:{{#invoke:params|sequential|squeezing|count}} > 2|,}} and |trimming_values|for_each|[[$@]]}}
	|{{Error|{{tl|Foobar see also}} requires at least one page name}}
}}}}</syntaxhighlight>

You can find this example at &#123;&#123;{{rel|Module:Params/doc/examples/Oxford comma}}&#125;&#125;. E.g., <syntaxhighlight lang="wikitext" inline>{{module:params/doc/examples/Oxford comma|Latin|English|German|Italian}}</syntaxhighlight> will generate

{{module:params/doc/examples/Oxford comma|Latin|English|German|Italian}}

{{vpad}}

{{A note}} The <code>setting</code> modifier will be trimmed of its surrounding spaces. The directives argument will be stripped of all space characters, including internal spaces. All the other arguments passed to this modifier will be parsed verbatim (i.e. leading and trailing spaces will not be removed).

{{vpad|1.5em}}

=== <code>squeezing</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>squeezing</code> <span style="nowrap">({{module:params/doc/link to the code|squeezing|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#sequential|sequential]]</code>, <code>[[#clearing|clearing]]</code>
}}

; Brief
: ''Rearrange all parameters that have numerical names to form a compact sequence starting from 1, keeping the same order''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|squeezing|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|squeezing|sequential|setting|i/p|<br />|: |list}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

The following three concatenations will lead to the same result of discarding all parameters with numerical names:

# <syntaxhighlight lang="wikitext" inline>{{...|non-sequential|squeezing|...}}</syntaxhighlight>
# <syntaxhighlight lang="wikitext" inline>{{...|squeezing|non-sequential|...}}</syntaxhighlight>
# <syntaxhighlight lang="wikitext" inline>{{...|with_name_not_matching|^%-?%d+$|...}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>filling_the_gaps</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>filling_the_gaps</code> <span style="nowrap">({{module:params/doc/link to the code|filling_the_gaps|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#squeezing|squeezing]]</code>, <code>[[#sequential|sequential]]</code>, <code>[[#clearing|clearing]]</code>
}}

; Brief
: ''Assign an empty string to all undefined numerical parameters between 1 or the lowest numerical parameter name provided and the maximum numerical parameter provided''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|filling_the_gaps|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|filling_the_gaps|sequential|setting|i/p|<br />|: |list}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Note that when all numerical parameters are lower than 1, the gap between 1 and the maximum numerical parameter will not be filled. The following table provides some examples.

{| class="wikitable" style="margin-left: auto; margin-right: auto;"
|+ Numerical parameters provided
|-
! Before calling <code>filling_the_gaps</code>
! After calling <code>filling_the_gaps</code>
|-
| 1
| 1
|-
| 2
| 1, 2
|-
| 6, 9
| 1, 2, 3, 4, 5, 6, 7, 8, 9
|-
| -5, -3
| -5, -4, -3
|-
| -5, -3, 1
| -5, -4, -3, -2, -1, 0, 1
|-
| -1
| -1
|-
| -2
| -2
|}

{{A note}} There is a safety limit of at most 1024 undefined parameters that can be filled using this function.

{{vpad|1.5em}}

=== <code>clearing</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>clearing</code> <span style="nowrap">({{module:params/doc/link to the code|clearing|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>
}}

; Brief
: ''Remove all numerical parameters that are not in the sequence''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|clearing|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Unlike <code>[[#sequential|sequential]]</code> – which affects only the way parameters are shown – this modifier actually removes all non-sequential numerical parameters, albeit leaves non-numerical parameters intact.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|clearing|setting|i/p|<br />|: |list}}</syntaxhighlight>

If you want to remove also non-numerical parameters, add the <code>[[#with_name_matching|with_name_matching]]</code> modifier:

<syntaxhighlight lang="wikitext">{{#invoke:params|clearing|with_name_matching|^%d+$|setting|i/p|<br />|: |list}}</syntaxhighlight>

If you want instead to remove sequential parameters and leave the rest, use <syntaxhighlight lang="wikitext" inline>{{...|cutting|-1|1|...}}</syntaxhighlight>:

<syntaxhighlight lang="wikitext">{{#invoke:params|cutting|-1|1|setting|i/p|<br />|: |list}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>cutting</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>cutting</code> <span style="nowrap">({{module:params/doc/link to the code|cutting|code}})</span>
| label1 = Num. of arguments | data1 = 2
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Remove zero or more parameters from the beginning and the end of the '''parameters' sequence'''''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|cutting|left trim|right trim|pipe function name}}</syntaxhighlight>

The first argument indicates how many sequential parameters must be removed from the beginning of the parameter sequence, the second argument indicates how many sequential parameters must be removed from the end of the parameter list. If any of the two arguments contains a negative number its absolute value indicates what must be left ''on the opposite side'' – i.e. <syntaxhighlight lang="wikitext" inline>{{#invoke:params|cutting|-3|0|list}}</syntaxhighlight> indicates that the last three arguments must not be discarded.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|cutting|0|2|sequential|call_for_each_value|example template}}</syntaxhighlight>

If the absolute value of the sum of the two arguments (left and right cut) is greater than the number of ''sequential'' parameters available, the behavior will be the same as if the sum had been equal to the number of sequential parameters available, both when this is a positive value and when it is a negative value (with opposite results). After the desired sequential parameters have been discarded, all numerical parameters will be shifted accordingly.

In some cases it might be necessary to concatenate more than one invocation of the <code>cutting</code> modifier. For instance, the following code prints the last unnamed parameter passed, but only if at least two parameters were passed:

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|cutting|1|0|cutting|-1|0|list_values}}</syntaxhighlight>

{{A note|Suggestion:}} Although <syntaxhighlight lang="wikitext" inline>{{#invoke:params|cutting|-1|1|...}}</syntaxhighlight> de facto gets rid of all sequential parameters, in most cases it is clearer and more idiomatic to write <syntaxhighlight lang="wikitext" inline>{{#invoke:params|non-sequential|...}}</syntaxhighlight> to obtain the same effect. The last method however cannot be used when it is important that sequential parameters are removed before a particular modifier is called, because <code>[[#non-sequential|non-sequential]]</code> does not take effect until the final function is invoked. Writing instead <syntaxhighlight lang="wikitext" inline>{{#invoke:params|sequential|cutting|-1|1|...}}</syntaxhighlight> will leave zero arguments to show.

{{vpad|1.5em}}

=== <code>cropping</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>cropping</code> <span style="nowrap">({{module:params/doc/link to the code|cropping|code}})</span>
| label1 = Num. of arguments | data1 = 2
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Remove zero or more parameters from the beginning and the end of the '''list of numerical parameters''' (not only the sequential ones)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|cropping|left crop|right crop|pipe function name}}</syntaxhighlight>

This function is very similar to <code>[[#cutting|cutting]]</code>, but instead of removing arguments from the extremities of the parameters' ''sequence'', arguments will be removed counting from the first and the last numerical arguments given (i.e. {{para|-1000|...}} and {{para|1000|...}} in the case of <syntaxhighlight lang="wikitext" inline>{{foobar|-1000=hello|1=my|1000=darling}}</syntaxhighlight>). If any of the two arguments contains a negative number its absolute value indicates what must be left ''on the opposite side''.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|cropping|2|1|sequential|call_for_each_value|example template}}</syntaxhighlight>

For instance, when a template transcluded as <syntaxhighlight lang="wikitext" inline>{{example template|-2=minus two|0=zero|1=one|2=two|3=three|19=nineteen|20=twenty}}</syntaxhighlight> invokes the <code>[[#cutting|cutting]]</code> function with <code>2</code> and <code>1</code> as arguments, as in the example above, the following parameters will be left:

: -2: minus two
: 0: zero
: 16: nineteen
: 17: twenty]

If instead the template invokes the <code>[[#cutting|cropping]]</code> function with <code>2</code> and <code>1</code> as arguments, the following parameters will be left:
: 0: zero
: 1: one
: 2: two
: 3: three
: 19: nineteen

If the absolute value of the sum of the two arguments (left and right crop) is greater than the difference between the largest and the lowest ''numerical'' parameters available, the behavior will be the same as if the sum had been equal to the number of numerical parameters available, both when this is a positive value and when it is a negative value (with opposite results). When ''sequential'' parameters are present among the discarded parameters, all the remaining numerical parameters greater than zero will be shifted accordingly.

{{vpad|1.5em}}

=== <code>purging</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>purging</code> <span style="nowrap">({{module:params/doc/link to the code|purging|code}})</span>
| label1 = Num. of arguments | data1 = 2
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Remove zero or more parameters from any point of the list of numerical parameters, shifting everything accordingly''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|purging|start offset|length|pipe function name}}</syntaxhighlight>

The first argument indicates at which point in the parameter list the removal must begin, the second argument indicates how many parameters must be discarded among it and what lies ''on the right side''. If the second argument contains zero or a negative number its absolute value indicates what must be left ''at the end of the right side'' of the list of numerical parameters – i.e. <syntaxhighlight lang="wikitext" inline>{{#invoke:params|purging|5|0|list}}</syntaxhighlight> indicates that every numerical argument whose numerical name is greater than <code>4</code> must be removed.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|purging|2|1|call_for_each_value|example template}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>backpurging</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>backpurging</code> <span style="nowrap">({{module:params/doc/link to the code|backpurging|code}})</span>
| label1 = Num. of arguments | data1 = 2
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#rotating|rotating]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Remove zero or more parameters from any point of the list of numerical parameters, moving backwards and shifting everything accordingly''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|backpurging|start offset|length|pipe function name}}</syntaxhighlight>

The first argument indicates at which point in the parameter list the removal must begin, the second argument indicates how many parameters must be discarded among it and what lies ''on the left side''. If the second argument contains zero or a negative number its absolute value indicates what must be left ''at the end of the left side'' of the list of numerical parameters – i.e. <syntaxhighlight lang="wikitext" inline>{{#invoke:params|purging|5|0|list}}</syntaxhighlight> indicates that every numerical argument whose numerical name is less than <code>6</code> must be removed.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|backpurging|3|1|call_for_each_value|example template}}</syntaxhighlight>

The following code removes all parameters with negative and zero numerical names, then lists the rest:

<syntaxhighlight lang="wikitext">{{#invoke:params|backpurging|0|0|for_each|[$#: $@]}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>rotating</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>rotating</code> <span style="nowrap">({{module:params/doc/link to the code|rotating|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Reverse the order of all numerical parameters (not only sequential ones), making sure that the largest numerical parameter and {{para|1}} are swapped''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|rotating|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|rotating|for_each|[$#: $@]}}</syntaxhighlight>
<!--
{{vpad|1.5em}}

=== <code>mirroring</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>mirroring</code> <span style="nowrap">({{module:params/doc/link to the code|mirroring|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Reverse the order of all numerical parameters (not only sequential ones)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mirroring|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

This modifier reverses the order of numerical parameters, making sure that the minimum and the maximum numerical parameters remain always the same (albeit inverted).

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|mirroring|for_each|[$#: $@]}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>pivoting</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>pivoting</code> <span style="nowrap">({{module:params/doc/link to the code|pivoting|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code>, <code>[[#mirroring|mirroring]]</code>, <code>[[#swapping|swapping]]</code>, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Reverse the order of all numerical parameters (not only sequential ones), '''keeping the parameters' sequence always centered'''''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|pivoting|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

This modifier reverses the order of numerical parameters, making sure that those in the parameters' sequence always remain in the sequence. As a consequence, the values of the minimum and the maximum numerical parameters may change. If no sequence is present this function is identical to <code>[[#mirroring|mirroring]]</code>.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|pivoting|for_each|[$#: $@]}}</syntaxhighlight>

{{vpad|1.5em}}

=== <code>swapping</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>swapping</code> <span style="nowrap">({{module:params/doc/link to the code|swapping|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#sorting_sequential_values|sorting_sequential_values]]</code>
}}

; Brief
: ''Swap the lowest numerical parameter with the highest, the second lowest with the second highest, and so on, keeping the sequence in the same place albeit in reverse order''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|swapping|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|swapping|for_each|[$#: $@]}}</syntaxhighlight>
-->
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=== <code>sorting_sequential_values</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>sorting_sequential_values</code> <span style="nowrap">({{module:params/doc/link to the code|sorting_sequential_values|code}})</span>
| label1 = Num. of arguments | data1 = 0 or 1
| label2 = Repeatable | data2 = Yes
| label3 = Often accompanied by | data3 = <code>[[#sequential|sequential]]</code>
| header4 = See also
| data5 = <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code><!--, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>-->, <code>[[#all_sorted|all_sorted]]</code>
}}

; Brief
: ''Sort the order of sequential values''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|sorting_sequential_values|[criterion]|pipe function name}}</syntaxhighlight>

{{A note}} This function sorts ''sequential parameters'' based on ''their values''. If you want to sort the way ''functions'' iterate across ''all'' parameters based on ''their names'', see <code>[[#all_sorted|all_sorted]]</code>.

This function optionally supports one argument to specify the sorting criterion. If this is omitted it is assumed that sequential values must be ordered alphabetically. Currently the only other possible criterion is <code>naturally</code>, for ordering sequential values in [[natural sort order]].

Example (alphabetical sort order):

<syntaxhighlight lang="wikitext">{{#invoke:params|sorting_sequential_values|for_each|[$#: $@]}}</syntaxhighlight>

Example (natural sort order):

<syntaxhighlight lang="wikitext">{{#invoke:params|sorting_sequential_values|naturally|for_each|[$#: $@]}}</syntaxhighlight>
<!--
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=== <code>inserting</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>inserting</code> <span style="nowrap">({{module:params/doc/link to the code|inserting|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#imposing|imposing]]</code>, <code>[[#sequential|sequential]]</code>, <code>[[#squeezing|squeezing]]</code>, <code>[[#filling_the_gaps|filling_the_gaps]]</code>, <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code>, <code>[[#rotating|rotating]]</code>, <code>[[#mirroring|mirroring]]</code>, <code>[[#pivoting|pivoting]]</code>, <code>[[#swapping|swapping]]</code>, <code>[[#discarding|discarding]]</code>, <code>[[#all_sorted|all_sorted]]</code>, <code>[[#new|new]]</code>
}}

; Brief
: ''Add one or more numerical parameters to the list of parameters, shifting everything accordingly''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|inserting|position|how many|...|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|inserting|1|2|hello|world|for_each|[$#: $@]}}</syntaxhighlight>

{{vpad}}

{{A note}} The values of the parameters inserted will not be trimmed of their leading and trailing spaces. The first two numerical arguments and the <code>inserting</code> function name itself, however, will be trimmed of their surrounding spaces.
-->
{{vpad|1.5em}}

=== <code>imposing</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>imposing</code> <span style="nowrap">({{module:params/doc/link to the code|imposing|code}})</span>
| label1 = Num. of arguments | data1 = 2
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#discarding|discarding]]</code><!--, <code>[[#inserting|inserting]]</code>-->, <code>[[#filling_the_gaps|filling_the_gaps]]</code><!--, <code>[[#new|new]]</code>-->
}}

; Brief
: ''Impose a new value to a parameter''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|imposing|name|value|pipe function name}}</syntaxhighlight>

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|imposing|foo|bar|imposing|hello|world|for_each|[$#: $@]}}</syntaxhighlight>

{{vpad}}

{{A note}} The value imposed will not be trimmed of its leading and trailing spaces. The name of the parameter and the <code>imposing</code> function name itself, however, will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>discarding</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>discarding</code> <span style="nowrap">({{module:params/doc/link to the code|discarding|code}})</span>
| label1 = Num. of arguments | data1 = 1 or 2
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#clearing|clearing]]</code>, <code>[[#cutting|cutting]]</code>, <code>[[#cropping|cropping]]</code>, <code>[[#purging|purging]]</code>, <code>[[#backpurging|backpurging]]</code><!--, <code>[[#inserting|inserting]]</code>, <code>[[#new|new]]</code>-->
}}

; Brief
: ''Discard one or more numerical parameters or one non-numerical parameter''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|discarding|name|[how many]|pipe function name}}</syntaxhighlight>

If, and only if, the name of the parameter is numerical, it is possible to add a second argument to indicate how many contiguous parameters must be discarded as well. If the discarded parameters is part of the parameters' sequence one or more holes will be created. To avoid creating holes, see <code>[[#purging|purging]]</code> or <code>[[#backpurging|backpurging]]</code>.

Example #1 (discard the parameter named {{para|hello}}):

<syntaxhighlight lang="wikitext">{{#invoke:params|discarding|hello|for_each|[$#: $@]}}</syntaxhighlight>

Example #2 (discard the parameter named {{para|5}}):

<syntaxhighlight lang="wikitext">{{#invoke:params|discarding|5|for_each|[$#: $@]}}</syntaxhighlight>

Example #3 (discard the parameters named {{para|1}}, {{para|2}}, {{para|3}} and {{para|4}}):

<syntaxhighlight lang="wikitext">{{#invoke:params|discarding|1|4|for_each|[$#: $@]}}</syntaxhighlight>

{{A note}} All arguments passed to this function and the <code>discarding</code> function name itself will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>with_name_matching</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>with_name_matching</code> <span style="nowrap">({{module:params/doc/link to the code|with_name_matching|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#with_name_not_matching|with_name_not_matching]]</code>, <code>[[#with_value_matching|with_value_matching]]</code>, <code>[[#with_value_not_matching|with_value_not_matching]]</code>
}}

; Brief
: ''Discard all parameters whose name ''does not match '''any''''' of the given patterns''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|with_name_matching|pattern 1|[plain flag 1]|[or]|[pattern 2]|[plain flag 2]|[or]|[...]|[pattern N]|[plain flag N]|pipe function name}}</syntaxhighlight>

Internally this modifier uses Lua's <code>[[:mw:Extension:Scribunto/Lua reference manual#string.find|string.find()]]</code> function to find whether parameter names match against given patterns; therefore, unless a plain flag is set, please use the same syntax of [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]]. The plain flag can be either <code>plain</code> or <code>strict</code> or omitted. When omitted it is assumed that the target string is a Lua pattern. The difference between <code>plain</code> and <code>strict</code> is that the latter also requires that the lengths match (this happens only when the two strings are 100% identical).

To express a [[Disjunction (logical connective)|logical OR]] the <code>or</code> keyword is available. To express a [[Logical conjunction|logical AND]] instead, concatenate more invocations of <code>with_name_matching</code>.

{{vpad}}

For the sake of argument we will imagine that we are invoking <code>with_name_matching</code> from within the {{tl|Infobox artery}} template, and this is being called with the following parameters:

{{tj|Infobox artery
	| Name: Pulmonary artery
	| Latin: truncus pulmonalis, arteria pulmonalis
	| Image: <nowiki>{{Heart diagram 250px}}</nowiki>
	| Caption: Anterior (frontal) view of the opened heart. (Pulmonary artery upper right.)
	| Image2: Alveoli diagram.png
	| Caption2: Diagram of the alveoli with both cross-section and external view.
	| BranchFrom: <nowiki>[[right ventricle]]</nowiki>
	| BranchTo:
	| Vein: <nowiki>[[pulmonary vein]]</nowiki>
	| Precursor: truncus arteriosus
	| Supplies:
}}

{{vpad}}

Test cases:

* List only the parameters whose names match against the <code>^Image</code> pattern:
*: ↳ <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_matching|^Image|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Image={{Heart diagram 250px}}|Image2=Alveoli diagram.png</nowiki>}}
* List the parameters whose names match against both patterns <code>^Image</code> '''and''' <code>%d+$</code>:
*: ↳ <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_matching|^Image|with_name_matching|%d+$|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Image2=Alveoli diagram.png</nowiki>}}
* List the parameters whose names match against either the <code>^Name</code> '''or''' the <code>^Latin$</code> pattern:
*: ↳ <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_matching|^Name$|or|^Latin$|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Latin=truncus pulmonalis, arteria pulmonalis|Name=Pulmonary artery</nowiki>}}
* List the parameters whose names match against either the <code>ma</code> plain string '''or''' the <code>me$</code> pattern:
*: ↳ <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_matching|ma|plain|or|me$|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Image={{Heart diagram 250px}}|Name=Pulmonary artery|Image2=Alveoli diagram.png</nowiki>}}

{{vpad}}

Using <code>with_name_matching</code> it is easy to emulate the behaviour of [[Module:Enumerate]] (or similar modules). For instance, the following examples creates a bullet list of all the parameters passed of type <code>&#124;foobar1</code>, <code>&#124;foobar2</code> … <code>&#124;foobarN</code>:

<syntaxhighlight lang="wikitext">{{#invoke:params|all_sorted|with_name_matching|^foobar%d+$|setting|ih|
* |list_values}}</syntaxhighlight>

It is possible to see this example live at &#123;&#123;{{rel|Module:Params/doc/examples/enumerate}}&#125;&#125;.

{{vpad}}

{{A note}} The pattern arguments passed to this function will not be trimmed of their leading and trailing spaces. The <code>or</code>, <code>plain</code> and <code>strict</code> keywords, and the <code>with_name_matching</code> function name itself, however, will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>with_name_not_matching</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>with_name_not_matching</code> <span style="nowrap">({{module:params/doc/link to the code|with_name_not_matching|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#with_name_matching|with_name_matching]]</code>, <code>[[#with_value_matching|with_value_matching]]</code>, <code>[[#with_value_not_matching|with_value_not_matching]]</code>
}}

; Brief
: ''Discard all parameters whose name ''matches '''all''''' the given patterns''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|with_name_not_matching|pattern 1|[plain flag 1]|[and]|[pattern 2]|[plain flag 2]|[and]|[...]|[pattern N]|[plain flag N]|pipe function name}}</syntaxhighlight>

Internally this modifier uses Lua's <code>[[:mw:Extension:Scribunto/Lua reference manual#string.find|string.find()]]</code> function to find whether parameter names match against given patterns; therefore, unless a plain flag is set, please use the same syntax of [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]]. The plain flag can be either <code>plain</code> or <code>strict</code> or omitted. When omitted it is assumed that the target string is a Lua pattern. The difference between <code>plain</code> and <code>strict</code> is that the latter also requires that the lengths match (this happens only when the two strings are 100% identical).

To express a [[Disjunction (logical connective)|logical OR]] the <code>or</code> keyword is available. To express a [[Logical conjunction|logical AND]] instead, concatenate more invocations of <code>with_name_not_matching</code>.

{{vpad}}

For the sake of argument we will imagine that we are invoking <code>with_name_not_matching</code> from within the {{tl|Infobox artery}} template, and this is being transcluded using the same parameters that we had imagined in the previous example at <code>[[#with_name_matching|with_name_matching]]</code>:

* List only the parameters whose names do not match against the <code>a</code> pattern:
*: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_not_matching|a|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Precursor=truncus arteriosus|Supplies=|Vein=pulmonary vein</nowiki>}}
* List the parameters whose names do not match against the <code>a</code> plain string '''and''' do not match against the <code>l</code> plain string either:
*: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_not_matching|a|plain|with_name_not_matching|l|plain|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Precursor=truncus arteriosus|Vein=pulmonary vein</nowiki>}}
* List the parameters whose names do not match against either the <code>a</code> plain string '''or''' the <code>n</code> plain string:
*: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|setting|ih/p|{{!}}|{{=}}|with_name_not_matching|a|plain|or|n|plain|list}}</syntaxhighlight>
*:: ↳ {{highlight round|bc=#ff9|<nowiki>|Precursor=truncus arteriosus|Supplies=|Image={{Heart diagram 250px}}|Name=Pulmonary artery|Image2=Alveoli diagram.png|Vein=pulmonary vein</nowiki>}}

{{vpad}}

It is possible to use this function to check for unknown parameters:

<syntaxhighlight lang="wikitext">{{#ifexpr:{{#invoke:params|with_name_not_matching|hello|strict|with_name_not_matching|wind|strict|count}} > 0
	|{{#invoke:Error|error|Error: The only parameters accepted are {{para|hello}} and {{para|wind}}.}}
	|Everything is good: do something
}}</syntaxhighlight>

You can find this example at &#123;&#123;{{rel|Module:Params/doc/examples/check for unknown parameters}}&#125;&#125;. E.g., <syntaxhighlight lang="wikitext" inline>{{module:params/doc/examples/check for unknown parameters|hello=world|wind=surfing}}</syntaxhighlight> will generate

: {{module:params/doc/examples/check for unknown parameters|hello=world|wind=surfing}}

For simple cases like this, however, specialized modules are available; you might want to have a look at:

* {{ml|Check for unknown parameters|check}}
* {{ml|Check for deprecated parameters|check}}
* {{ml|Check for clobbered parameters|check}}
* {{ml|Parameter validation|validateparams}}
* {{ml|TemplatePar|valid}}

{{vpad}}

{{A note}} The pattern arguments passed to this function will not be trimmed of their leading and trailing spaces. The <code>or</code>, <code>plain</code> and <code>strict</code> keywords, and the <code>with_name_not_matching</code> function name itself, however, will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>with_value_matching</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>with_value_matching</code> <span style="nowrap">({{module:params/doc/link to the code|with_value_matching|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#with_name_matching|with_name_matching]]</code>, <code>[[#with_name_not_matching|with_name_not_matching]]</code>, <code>[[#with_value_not_matching|with_value_not_matching]]</code>
}}

; Brief
: ''Discard all parameters whose value ''does not match '''any''''' of the given patterns''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|with_value_matching|pattern 1|[plain flag 1]|[or]|[pattern 2]|[plain flag 2]|[or]|[...]|[pattern N]|[plain flag N]|pipe function name}}</syntaxhighlight>

Exactly like <code>[[#with_name_matching|with_name_matching]]</code>, but applied to parameter values instead of names.

Internally this modifier uses Lua's <code>[[:mw:Extension:Scribunto/Lua reference manual#string.find|string.find()]]</code> function to find whether parameter names match against given patterns; therefore, unless a plain flag is set, please use the same syntax of [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]]. The plain flag can be either <code>plain</code> or <code>strict</code> or omitted. When omitted it is assumed that the target string is a Lua pattern. The difference between <code>plain</code> and <code>strict</code> is that the latter also requires that the lengths match (this happens only when the two strings are 100% identical).

Example:

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_matching|banana|count}}</syntaxhighlight>

{{vpad}}

{{A note}} The pattern arguments passed to this function will not be trimmed of their leading and trailing spaces. The <code>or</code>, <code>plain</code> and <code>strict</code> keywords, and the <code>with_value_matching</code> function name itself, however, will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>with_value_not_matching</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>with_value_not_matching</code> <span style="nowrap">({{module:params/doc/link to the code|with_value_not_matching|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#with_name_matching|with_name_matching]]</code>, <code>[[#with_name_not_matching|with_name_not_matching]]</code>, <code>[[#with_value_matching|with_value_matching]]</code>
}}

; Brief
: ''Discard all parameters whose value ''matches '''all''''' the given patterns''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|with_value_not_matching|pattern 1|[plain flag 1]|[and]|[pattern 2]|[plain flag 2]|[and]|[...]|[pattern N]|[plain flag N]|pipe function name}}</syntaxhighlight>

Exactly like <code>[[#with_name_not_matching|with_name_not_matching]]</code>, but applied to parameter values instead of names.

Internally this modifier uses Lua's <code>[[:mw:Extension:Scribunto/Lua reference manual#string.find|string.find()]]</code> function to find whether parameter names match against given patterns; therefore, unless a plain flag is set, please use the same syntax of [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]]. The plain flag can be either <code>plain</code> or <code>strict</code> or omitted. When omitted it is assumed that the target string is a Lua pattern. The difference between <code>plain</code> and <code>strict</code> is that the latter also requires that the lengths match (this happens only when the two strings are 100% identical).

For instance, before calling <code>[[#list|list]]</code>, the following code will get rid of all blank parameters (i.e. parameters whose values contain only zero or more spaces):

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_not_matching|^%s*$|setting|hi/p|{{!}}|{{=}}|list}}</syntaxhighlight>

A typical use case of this function is that of purging all empty incoming parameters before calling another template, especially when this [[Help:Conditional expressions#Checking for template parameters|distinguishes between empty and undefined parameters]].

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_not_matching|^%s*$|concat_and_call|my template}}</syntaxhighlight>

{{vpad}}

{{A note}} The pattern arguments passed to this function will not be trimmed of their leading and trailing spaces. The <code>or</code>, <code>plain</code> and <code>strict</code> keywords, and the <code>with_value_not_matching</code> function name itself, however, will be trimmed of their surrounding spaces.

{{vpad|1.5em}}

=== <code>trimming_values</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>trimming_values</code> <span style="nowrap">({{module:params/doc/link to the code|trimming_values|code}})</span>
| label1 = Num. of arguments | data1 = 0
| label2 = Repeatable | data2 = Yes
}}

; Brief
: ''Remove leading and trailing spaces from values''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|trimming_values|pipe function name}}</syntaxhighlight>

This modifier does not take arguments besides the name of the function that will follow.

Most modifiers are order-dependent, therefore placing <code>trimming_values</code> in different positions can generate different results. For instance, imagining our <syntaxhighlight lang="wikitext" inline>{{example template}}</syntaxhighlight> being called with the following spaced arguments: <syntaxhighlight lang="wikitext" inline>{{example template| wanna | be | my | friend | ? }}</syntaxhighlight>. If <syntaxhighlight lang="wikitext" inline>{{example template}}</syntaxhighlight> contained the following code,

<syntaxhighlight lang="wikitext">{{#invoke:params|with_value_matching|%s+$|trimming_values|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

the following text would be printed: <code>1=wanna|2=be|3=my|4=friend|5=?</code>. But if instead it contained the following code,

<syntaxhighlight lang="wikitext">{{#invoke:params|trimming_values|with_value_matching|%s+$|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

no arguments would be shown.

Order affects also performance, and how many values will be trimmed of their leading and trailing spaces will depend on where <code>trimming_values</code> is placed. For instance, if a template were invoked with 50 parameters and its code contained <syntaxhighlight lang="wikitext" inline>{{#invoke:params|trimming_values|cutting|-1|0|list}}</syntaxhighlight>, first all its values would be trimmed of leading and trailing blank spaces and then its first 49 parameters would be discarded. On the other hand, writing <syntaxhighlight lang="wikitext" inline>{{#invoke:params|cutting|-1|0|trimming_values|list}}</syntaxhighlight> would first discard 49 parameters and then trim the only value left, resulting in a more efficient code. As a general rule, placing <code>trimming_values</code> as the last modifier is usually the best choice.

In most cases placing <code>trimming_values</code> together with <code>non-sequential</code> will result in an empty call with no effects, because non-sequential parameters are normally stripped of their leading and trailing spaces by default – this however depends on the caller, and if the current template is being called by a module it is in theory possible in specific conditions for named parameters to retain their leading and trailing spaces (namely in non-sequential numerical parameters).

Using <code>trimming_values</code> makes this module behave like many Wikipedia modules behave. For example, if we wanted to emulate {{ml|Separated entries|main}}, writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|squeezing|trimming_values|setting|i|XXXX|list_values}}</syntaxhighlight>

will be equivalent to writing,

<syntaxhighlight lang="wikitext">{{#invoke:separated entries|main|separator=XXXX}}</syntaxhighlight>

whereas writing

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|squeezing|trimming_values|setting|i/l|XXXX|YYYY|list_values}}</syntaxhighlight>

will be equivalent to writing

<syntaxhighlight lang="wikitext">{{#invoke:separated entries|main|separator=XXXX|conjunction=YYYY}}</syntaxhighlight>

The &#123;&#123;{{rel|Module:Params/doc/examples/trim and call}}&#125;&#125; example template shows how to call any arbitrary template trimming all parameters beforehand.

{{vpad|1.5em}}

=== <code>mapping_by_calling</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>mapping_by_calling</code> <span style="nowrap">({{module:params/doc/link to the code|mapping_by_calling|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>, <code>[[#renaming_by_calling|renaming_by_calling]]</code>, <code>[[#renaming_by_invoking|renaming_by_invoking]]</code>, <code>[[#renaming_by_magic|renaming_by_magic]]</code>
}}

; Brief
: ''[[Map (higher-order function)|Map]] all parameter values, replacing their content with the expansion of a given template repeatedly called with one parameter (the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|template name|[call style]|[let]|[...]|[number of additional parameters]|[parameter 1]|[parameter 2]|[...]|[parameter N]|pipe function name}}</syntaxhighlight>

This modifier (temporarily) changes the content of the parameters the current template is being called with, replacing each of them with the text returned by another template. The latter will be repeatedly called with at least one parameter as first sequential parameter: the parameter's value.

It is possible to pass the parameter's value as a different parameter, or pass the parameter's name as well, by specifying a call style flag immediately after the template name (see below).

If the call style flag or (if omitted) the template name is followed by one or more groups of three arguments led by the <code>let</code> keyword (i.e. <code>let&#124;name&#124;value</code>), these will be passed to the mapping template.

If the last group of three arguments or (if omitted) the call style flag or (if omitted) the template name is followed by a number, this will be parsed as the amount of positional parameters to add. These will always follow the parameter's name and value if any of the latter has a numerical name greater than zero.

In case of collisions, the parameters assigned via the <code>let</code> keyword will be given precedence over everything else.

For instance, before listing all parameters,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_calling|foobar|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will replace each value with the expansion of <syntaxhighlight lang="wikitext" inline>{{foobar|VALUE}}</syntaxhighlight> (where <code>VALUE</code> indicates each different value).

On the other hand,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_calling|foobar|names_and_values|let|rice|nope|let|curry|lots!|2|hello|world|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will do the same, but using the expansion of <syntaxhighlight lang="wikitext" inline>{{foobar|NAME|VALUE|hello|world|rice=nope|curry=lots!}}</syntaxhighlight> (where <code>NAME</code> and <code>VALUE</code> indicate each different name and value).

Possible call style flags are:

{| class="wikitable"
|-
! Call style flag
! Example
! Corresponding call
|-
| <code>names_and_values</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|names_and_values|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|NAME|VALUE|hello|world|foo=bar}}</syntaxhighlight>
|-
| <code>values_and_names</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|values_and_names|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|VALUE|NAME|hello|world|foo=bar}}</syntaxhighlight>
|-
| <code>names_only</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|names_only|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|NAME|hello|world|foo=bar}}</syntaxhighlight>
|-
| <code>values_only</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|values_only|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|VALUE|hello|world|foo=bar}}</syntaxhighlight>
|-
| <code>names_and_values_as&#124;...&#124;...</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|names_and_values_as|my_name|my_value|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|hello|world|my_name=NAME|my_value=VALUE|foo=bar}}</syntaxhighlight>
|-
| <code>names_only_as&#124;...</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|names_only_as|my_name|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|hello|world|my_name=NAME|foo=bar}}</syntaxhighlight>
|-
| <code>values_only_as&#124;...</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|values_only_as|my_value|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|hello|world|my_value=VALUE|foo=bar}}</syntaxhighlight>
|-
| <code>blindly</code>
| <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_calling|example template|blindly|let|foo|bar|2|hello|world|setting|i/p|<br />| → |list}}</syntaxhighlight>
| <syntaxhighlight lang="wikitext" inline>{{example template|hello|world|foo=bar}}</syntaxhighlight>
|}

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>mapping_by_calling</code> modifier name itself, the template name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional parameters will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

=== <code>mapping_by_invoking</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>mapping_by_invoking</code> <span style="nowrap">({{module:params/doc/link to the code|mapping_by_invoking|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>, <code>[[#renaming_by_calling|renaming_by_calling]]</code>, <code>[[#renaming_by_invoking|renaming_by_invoking]]</code>, <code>[[#renaming_by_magic|renaming_by_magic]]</code>
}}

; Brief
: ''[[Map (higher-order function)|Map]] all parameter values, replacing their content with the text returned by a given module function repeatedly invoked with at least one argument (the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_invoking|module name|function name|[call style]|[let]|[...]|[number of additional arguments]|[argument 1]|[argument 2]|[...]|[argument N]|pipe function name}}</syntaxhighlight>

This modifier (temporarily) changes the content of the parameters the current template is being called with, replacing each of them with the text returned by a custom module function. The latter will be repeatedly called with at least one argument as first sequential argument: the parameter's value.

It is possible to pass the parameter's value as a different argument, or pass the parameter's name as well, by specifying a call style flag immediately after the function name (see <code>[[#mapping_by_calling|mapping_by_calling]]</code> for the list of possible flags).

If the call style flag or (if omitted) the function name is followed by one or more groups of three arguments led by the <code>let</code> keyword (i.e. <code>let&#124;name&#124;value</code>), these will be passed to the mapping module function.

If the last group of three arguments or (if omitted) the call style flag or (if omitted) the function name is followed by a number, this will be parsed as the amount of positional parameters to add. These will always follow the parameter's name and value if any of the latter has a numerical name greater than zero.

In case of collisions, the arguments assigned via the <code>let</code> keyword will be given precedence over everything else.

For instance, before listing all parameters,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_invoking|foobar|main|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will replace each value with the expansion of <syntaxhighlight lang="wikitext" inline>{{#invoke:foobar|main|VALUE}}</syntaxhighlight> (where <code>VALUE</code> indicates each different value).

On the other hand,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_invoking|foobar|main|names_and_values|let|rice|nope|let|curry|lots!|2|hello|world|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will do the same, but using the expansion of <syntaxhighlight lang="wikitext" inline>{{#invoke:foobar|main|NAME|VALUE|hello|world|rice=nope|curry=lots!}}</syntaxhighlight> (where <code>NAME</code> and <code>VALUE</code> indicate each different name and value).

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>mapping_by_invoking</code> modifier name itself, the module name, the function name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional arguments will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

=== <code>mapping_by_magic</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>mapping_by_magic</code> <span style="nowrap">({{module:params/doc/link to the code|mapping_by_magic|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#renaming_by_calling|renaming_by_calling]]</code>, <code>[[#renaming_by_invoking|renaming_by_invoking]]</code>, <code>[[#renaming_by_magic|renaming_by_magic]]</code>
}}

; Brief
: ''[[Map (higher-order function)|Map]] all parameter values, replacing their content with the expansion of a given parser function repeatedly called with at least one argument (the parameter's value)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|mapping_by_magic|parser function|[call style]|[let]|[...]|[number of additional arguments]|[argument 1]|[argument 2]|[...]|[argument N]|pipe function name}}</syntaxhighlight>

This modifier (temporarily) changes the content of the parameters the current template is being called with, replacing each of them with the text returned by a [[:mw:Help:Magic words#Parser functions|parser function]]. The latter will be repeatedly called with at least one argument as first sequential argument: the parameter's value.

It is possible to pass the parameter's value as a different argument, or pass the parameter's name as well, by specifying a call style flag immediately after the template name (see <code>[[#mapping_by_calling|mapping_by_calling]]</code> for the list of possible flags).

If the call style flag or (if omitted) the template name is followed by one or more groups of three arguments led by the <code>let</code> keyword (i.e. <code>let&#124;name&#124;value</code>), these will be passed to the parser function.

If the last group of three arguments or (if omitted) the call style flag or (if omitted) the template name is followed by a number, this will be parsed as the amount of positional arguments to add. These will always follow the parameter's name and value if any of the latter has a numerical name greater than zero.

In case of collisions, the arguments assigned via the <code>let</code> keyword will be given precedence over everything else.

For instance, before listing all parameters,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_magic|uc|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will replace each value with the expansion of <syntaxhighlight lang="wikitext" inline>{{uc:VALUE}}</syntaxhighlight> (where <code>VALUE</code> indicates each different value).

On the other hand,

<syntaxhighlight lang="wikitext">{{#invoke:params|mapping_by_magic|plural|names_and_values|1|They are many|setting|i/p|{{!}}|{{=}}|list}}</syntaxhighlight>

will do the same, but using the expansion of <syntaxhighlight lang="wikitext" inline>{{plural:NAME|VALUE|They are many}}</syntaxhighlight> (where <code>NAME</code> and <code>VALUE</code> indicate each different name and value).

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>mapping_by_magic</code> modifier name itself, the parser function's name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional arguments will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

=== <code>renaming_by_calling</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>renaming_by_calling</code> <span style="nowrap">({{module:params/doc/link to the code|renaming_by_calling|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>, <code>[[#renaming_by_invoking|renaming_by_invoking]]</code>, <code>[[#renaming_by_magic|renaming_by_magic]]</code>
}}

; Brief
: ''Rename all parameters, replacing their former names with the expansion of a given template repeatedly called with at least one parameter (the parameter's former name)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|renaming_by_calling|template name|[call style]|[let]|[...]|[number of additional parameters]|[parameter 1]|[parameter 2]|[...]|[parameter N]|pipe function name}}</syntaxhighlight>

This modifier works similarly to <code>[[#mapping_by_calling|mapping_by_calling]]</code>, but instead of replacing parameters' values '''it renames the parameters themselves'''. Care must be used knowing that if a new name collides with another new name one of the two parameters will be removed without knowing which one. New names and old names do not create collisions. If a name is returned identical it will be considered as “unchanged” and in case of conflicts the renamed one will prevail. Possible leading and trailing spaces in the new names are always stripped.

For instance, the following example uses {{tl|2x}} to rename all incoming parameters by doubling their names:

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|h/i/p/f|[|][|: |]|renaming_by_calling|2x|list}}</syntaxhighlight>

Same, but adding a hyphen in between:

<syntaxhighlight lang="wikitext">{{#invoke:params|setting|h/i/p/f|[|][|: |]|renaming_by_calling|2x|1|-|list}}</syntaxhighlight>

This function can be particularly useful for sanitizing parameter names (e.g. collapsing several spaces into single spaces, changing the [[letter case]], and so on).

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>renaming_by_calling</code> modifier name itself, the template name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional arguments will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

=== <code>renaming_by_invoking</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>renaming_by_invoking</code> <span style="nowrap">({{module:params/doc/link to the code|renaming_by_invoking|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>, <code>[[#renaming_by_calling|renaming_by_calling]]</code>, <code>[[#renaming_by_magic|renaming_by_magic]]</code>
}}

; Brief
: ''Rename all parameters, replacing their former names with the text returned by a given module function repeatedly called with at least one argument (the parameter's former name)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|renaming_by_invoking|module name|function name|[call style]|[let]|[...]|[number of additional arguments]|[argument 1]|[argument 2]|[...]|[argument N]|pipe function name}}</syntaxhighlight>

This modifier works similarly to <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, but instead of replacing parameters' values '''it renames the parameters themselves'''. Care must be used knowing that if a new name collides with another new name one of the two parameters will be removed without knowing which one. New names and old names do not create collisions. If a name is returned identical it will be considered as “unchanged” and in case of conflicts the renamed one will prevail. Possible leading and trailing spaces in the new names are always stripped.

For instance, the following example uses {{mfl|string|replace}} to rename all parameters of type {{para|arg1}}, {{para|arg2}}, … {{para|argN}} into {{para|1}}, {{para|2}} … {{para|N}}, thus creating a novel sequence:

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|setting|h/i/p/f|[|][|: |]|with_name_matching|^arg%d+$|renaming_by_invoking|string|replace|4|^arg(%d+)$|%1|1|false|list}}</syntaxhighlight>

This function can be particularly useful for sanitizing parameter names (e.g. collapsing several spaces into single spaces, changing the [[letter case]], and so on).

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>renaming_by_invoking</code> modifier name itself, the module name, the function name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional arguments will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

=== <code>renaming_by_magic</code> ===
{{Infobox|headerstyle=background:lavender
| titlestyle = font-weight:normal; font-size:100%;
| title = Modifier <code>renaming_by_magic</code> <span style="nowrap">({{module:params/doc/link to the code|renaming_by_magic|code}})</span>
| label1 = Num. of arguments | data1 = ''Ad libitum''
| label2 = Repeatable | data2 = Yes
| header3 = See also
| data4 = <code>[[#mapping_by_calling|mapping_by_calling]]</code>, <code>[[#mapping_by_invoking|mapping_by_invoking]]</code>, <code>[[#mapping_by_magic|mapping_by_magic]]</code>, <code>[[#renaming_by_calling|renaming_by_calling]]</code>, <code>[[#renaming_by_invoking|renaming_by_invoking]]</code>
}}

; Brief
: ''Rename all parameters, replacing their former names with the text returned by a given parser function repeatedly called with at least one argument (the parameter's former name)''
; Syntax
: <syntaxhighlight lang="wikitext" inline>{{#invoke:params|renaming_by_magic|parser function|[call style]|[let]|[...]|[number of additional arguments]|[argument 1]|[argument 2]|[...]|[argument N]|pipe function name}}</syntaxhighlight>

This modifier works similarly to <code>[[#mapping_by_magic|mapping_by_magic]]</code>, but instead of replacing parameters' values '''it renames the parameters themselves'''. Care must be used knowing that if a new name collides with another new name one of the two parameters will be removed without knowing which one. New names and old names do not create collisions. If a name is returned identical it will be considered as “unchanged” and in case of conflicts the renamed one will prevail. Possible leading and trailing spaces in the new names are always stripped.

This function can be particularly useful for sanitizing parameter names (e.g. changing the [[letter case]], or URL encoding/decoding, and so on).

For instance, the following example uses &#123;&#123;[[:mw:Help:Magic words#lc|lc]]&#125;&#125; to sanitize all parameter names confining them to their lower case version:

<syntaxhighlight lang="wikitext">{{#invoke:params|sequential|setting|h/i/p/f|[|][|: |]|renaming_by_magic|lc|list}}</syntaxhighlight>

{{vpad}}

{{A note}} All arguments passed to this modifier except the <code>renaming_by_magic</code> modifier name itself, the parser function name, the call style flag, the <code>let</code> keyword, the passed parameter names, and the number of additional arguments will not be trimmed of their leading and trailing spaces.

{{vpad|1.5em}}

== Subpages ==
* [[Module:Params/ChangeLog]] – Record of the most important changes in the module's code
* [[Module:Params/testcases]] – Testing the module's capabilities
* [[Module:Params/doc/examples]] – Some of the examples mentioned in this documentation

The complete list of subpages is available [[Special:PrefixIndex/Module:Params/|here]].

== Notes ==
<references />

== See also ==
* {{ml|TemplatePar|}}
* {{ml|ParameterCount|}}
* {{ml|Separated entries|main}}
* {{ml|Enumerate|main}}
* {{ml|Check for unknown parameters|check}}
* {{ml|Check for deprecated parameters|check}}
* {{ml|Check for clobbered parameters|check}}
* {{ml|Parameter validation|}}
* {{ml|Expand wikitext|main}}
* {{ml|For loop|main}} and {{tl|For loop}}
* {{ml|For nowiki|template}} and {{tl|For nowiki}}
* [[Project:TemplateData]]

<includeonly>{{Sandbox other||
<!-- Categories below this line; interwikis at Wikidata -->
[[Category:Template metamodules]]
[[Category:Unknown parameters| ]]
}}</includeonly>