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:<tt><nowiki>{{#if: foo | | no}}</nowiki></tt> → ''' {{#if: foo | | no}}'''
See [[mediawikiwiki:Help:Parser functions in templates]] for more examples of this parser function.
==#ifeq==
:<tt><nowiki>{{#ifexist:</nowiki> XXX{{FULLPAGENAME}}XXX | exists | doesn't exist <nowiki>}}</nowiki></tt> → '''{{#ifexist: XXX{{FULLPAGENAME}}XXX | exists | doesn't exist }}'''
The function evaluates to true for [[mediawikiwiki:Help:System messages|system messages]] that have been customised, and for [[Help:Special pages|special pages]] that are defined by the software.
:<tt><nowiki>{{#ifexist:</nowiki> {{#special:Watchlist}} | exists | doesn't exist <nowiki>}}</nowiki></tt> → '''{{#ifexist: Special:Watchlist | exists | doesn't exist }}'''
* [[mediawikiwiki:Extension:StringFunctions]]
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