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{{Documentation subpage}}
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This module provides a consistent interface for processing boolean or boolean-style string input.
While Lua allows the <code>true</code> and <code>false</code> boolean values, wikicode templates can only express boolean values through strings such as "1", "0", "yes", "no", etc.
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It also returns <code>nil</code> values as <code>nil</code>, to allow for distinctions between <code>nil</code> and <code>false</code>.
The module also accepts other Lua structures as input, i.e. booleans, numbers, tables, and functions.
If it is passed input that it does not
== Syntax ==
<syntaxhighlight lang="lua">
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Boolean input or boolean-style input (see below) always evaluates to either <code>true</code> or <code>false</code>, and <code>nil</code> always evaluates to <code>nil</code>.
Other values evaluate to <code>default</code>.
== Usage ==
First, load the module. Note that it can only be loaded from other Lua modules, not from normal wiki pages.
<syntaxhighlight lang="lua">
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yesno(function() return 'This is a function.' end, 'bar')
</syntaxhighlight>
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Note that the blank string also functions this way:
<syntaxhighlight lang="lua">
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This module prefers the Lua behaviour over the wikitext behaviour.
If treating the blank string as <code>false</code> is important for your module, you will need to remove blank arguments at an earlier stage of processing.
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[[Category:Modules]]
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