Template:Yesno

{{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.

Usage

The template distinguishes five different types of input, supplied on the first unnamed parameter:

1. Yes: Case-insensitive forms of Yes, y, true, on, and 1; e.g. {{Yesno|yEs}}
2. No: Case-insensitive forms of No, n, false, off, and 0; e.g. {{Yesno|nO}}
3. Nothing: When the input is defined but either contains no value or consists of whitespace character only; i.e. {{Yesno|}} or {{Yesno| }}
4. Negation: When the input is either ¬ or entirely missing; i.e. {{Yesno|¬}} or {{Yesno}}
5. Anything else: e.g. {{Yesno|Purple monkey dish washer}}

By default, the template returns "yes" in the first and last case but returns nil (blank, empty string) in the other cases.

From Wikipedia:Template:Yesno because it's used in other documentation templates.