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Boolean values: Difference between revisions
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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]
=={{header|Scala}}==
Booleans in Scala are given by the literals <code>true</code> and <code>false</code>, case sensitive, which are the only instances of the class <code>Boolean</code>.
=={{header|Scheme}}==
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