{{Yesno}} (or {{YesNo}}) evaluates any input and produces a normalized yes or nil output, based on the content of the input and several configurable options. It is not used in article prose, but in coding complex templates.
The template distinguishes five different types of input, supplied on the first unnamed parameter:
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Yes, y, true, on, and 1; e.g. {{Yesno|yEs}} → yesNo, n, false, off, and 0; e.g. {{Yesno|nO}} →{{Yesno|}} or {{Yesno| }} →¬ (alt code 170) or entirely missing; i.e. {{Yesno|¬}} or {{Yesno}} →{{Yesno|Purple monkey dish washer}} → yesBy default, the template returns "yes" in the first and last case but returns nil (blank, empty string) in the other cases.
Two short-hand templates for the most common uses that override the default behavior:
{{yesno-yes}} or {{YesNo-Yes}} – always returns "yes" (or the specified replacement result in |yes=) unless an explicit negative value is given; i.e., it evaluates to "yes" even when the value is empty or missing.{{yesno-no}} or {{YesNo-No}} – always returns "no" (or the specified replacement result in |no=) unless an explicit positive value is given; i.e., it evaluates to "no" even when the value is present, as long as it does not contain anything that resolves to "yes".Template's default output can be customized with five named parameters, respectively: |yes=, |no=, |blank=, |¬= and |def=. If these parameters are specified, the template response is as follows:
|yes=, otherwise returns "yes". For example:{{yesno|y|yes=Yeah}} results in "Yeah"{{yesno|y|yes=bacon}} results in "bacon"|no=, otherwise returns blank. For example:{{yesno|n|no=Nay}} results in "Nay"{{yesno|n|no=ham}} results in "ham"|blank=, or of |no= in absence of the former; otherwise, returns blank.{{yesno|blank=eggs}} results in "eggs"{{yesno|no=ham}} results in "ham"{{yesno|blank=eggs|no=ham}} results in "eggs"|¬=, otherwise returns blank. For example:{{yesno|¬|¬=sausage}} results in "sausage"|def=, or of |yes= in absence of the former; otherwise, returns "yes".{{yesno|purple monkey dish washer|def=cup of tea}} results in "cup of tea"{{yesno|purple monkey dish washer|yes=bacon}} results in "bacon"{{yesno|purple monkey dish washer|def=cup of tea|yes=bacon}} results in "cup of tea"For the named parameters, use of a blank value is not the same as omitting the parameter. A blank named parameter tells the template that the customized return value is blank. For example:
{{yesno|purple monkey dish washer}} results in "yes"{{yesno|purple monkey dish washer|def=}} results in "" [blank]Unnamed parameter 1= the input value to be evaluated. The other parameters (all named, all optional), are the return values for their respective logical outcome. When set, each one overrules their default return value.
{{Yesno-yes}} – variant of Yesno that defaults to "yes" if value is not explicitly negative{{Yesno-no}} – variant of Yesno that defaults to "no" if value is not explicitly positiveTemplateData for Yesno
This template normalises an input to be a yes or nil output.