Editing Help:Magic words (section)

===Conditional===
{{further|Help:Conditional expressions}}

{| class="wikitable plainrowheaders"
! scope="col" | Function
! scope="col" | Description
|-
! scope="row" id="expr" |<kbd>[[mw:Help:Extension:Parser functions##expr|{<nowiki/>{#expr:''expression''}}]] </kbd>
| Evaluates ''expression'' (see [[mw:Manual:Expr parser function syntax]]).
|-
! scope="row" id="if" | <kbd>[[mw:Help:Extension:Parser functions##if|{<nowiki/>{#if:''string'' {{pipe}}''result1'' {{pipe}}''result2''}}]] </kbd>
| Outputs ''result2'' if ''string'' is [[Empty string|empty]], otherwise outputs ''result1''.
|-
! scope="row" id="ifeq" | <kbd>[[mw:Help:Extension:Parser functions##ifeq|{<nowiki/>{#ifeq:''string1''{{pipe}}''string2'' {{pipe}}''result1'' {{pipe}}''result2''}}]] </kbd>
| Outputs ''result1'' if ''string1'' and ''string2'' are equal (alphabetically or numerically), otherwise outputs ''result2''.
|-
! scope="row" id="iferror" | <kbd>[[mw:Help:Extension:Parser functions##iferror|{<nowiki/>{#iferror:''test_string'' {{pipe}}''result1'' {{pipe}}''result2''}}]] </kbd>
| Outputs ''result1'' if ''test_string'' generates a parsing error, otherwise outputs ''result2''.
|-
! scope="row" id="ifexpr" | <kbd>[[mw:Help:Extension:Parser functions##ifexpr|{<nowiki/>{#ifexpr:''expression'' {{pipe}}''result1'' {{pipe}}''result2''}}]] </kbd>
| Outputs ''result1'' if ''expression''{{thinsp}} is true, otherwise outputs ''result2''.
|-
! scope="row" id="ifexist" | <kbd>[[mw:Help:Extension:Parser functions##ifexist|{<nowiki/>{#ifexist:''pagetitle'' {{pipe}}''result1'' {{pipe}}''result2''}}]]{{efn|name=expensive|This function is an [[CP:EXPENSIVE|expensive]] parser function.}}</kbd>
| Outputs ''result1'' if the page [<nowiki/>[''pagetitle'']] exists, otherwise outputs ''result2''. Note that underscores are needed for spaces in namespaces.
|-
! scope="row" style="white-space: nowrap;" | <kbd>[[mw:Help:Extension:Parser functions##switch|{<nowiki/>{#switch:''string'' {{pipe}}''c1''=''r1'' {{pipe}}''c2''=''r2'' ... {{pipe}}''default''}}]] </kbd>
| Outputs ''r1'' if ''string'' is ''c1'', ''r2'' if ''string'' is ''c2'', etc., otherwise outputs ''default'' (if provided).
|}

If, in these conditional functions, [[Empty string|empty]] unnamed parameters are to be parsed as empty rather than as text (i.e. as empty rather than as the text "{{{1}}}", "{{{2}}}", etc.), they will require trailing pipes (i.e. <kbd>{{(((}}1{{pipe}}{{)))}}</kbd>, <kbd>{{(((}}2{{pipe}}{{)))}}</kbd>, etc., rather than <kbd>{{(((}}1{{)))}}</kbd>, <kbd>{{(((}}2{{)))}}</kbd>, etc.).
* For the use of these functions in tables, see [[Help:Conditional tables]].
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*