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Boolean values: Difference between revisions
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Perl has no special "true" or "false" keywords.
[http://perldoc.perl.org/perlsyn.html#Truth-and-Falsehood]
=={{header|Python}}==
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Everything else is true. Constant <code>True</code> exists.
[http://docs.python.org/reference/expressions.html#boolean-operations]
=={{header|Ruby}}==
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<code>false</code>, <code>nil</code> and <code>true</code> are singleton instances of classes <code>FalseClass</code>, <code>NilClass</code> and <code>TrueClass</code> respectively.
[http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_expressions.html#UF]
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