Even or odd: Difference between revisions
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Outputs E if even, O if odd.
=={{header|Binary Lambda Calculus}}==
In lambda calculus, the oddness of a given church numeral n can be computed as n applications of <code>not</code> to <code>false</code>: <code>\n. n (\b\x\y. b y x) (\x\y.y)</code>, which in BLC is
<pre>00 01 01 10 0000000101111010110 000010</pre>
To compute the evenness, one need only replace <code>false</code> by <code>true</code>, i.e. replace the final 0 bit by 10.
=={{header|BQN}}==
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return true
}</syntaxhighlight>
=={{header|Swift}}==
<syntaxhighlight lang="swift">
// Swift has Int.isMultiple(of:Int) -> Bool
var isEven: (_:Int) -> Bool = {$0.isMultiple(of: 2)}
</syntaxhighlight>
=={{header|Symsyn}}==
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