Map (higher-order function): Difference between revisions

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{{one source|date=November 2012}}

In many [[programming language]]s, <code>'''map'''</code> is the name of a [[higher-order function]] that applies a given [[Procedural parameter|function]] to each element of a [[list (computing)|list]], returning a list of results. It is often called ''apply-to-all'' when considered in [[functional form]]. <!-- This is an example of [[functor]]iality. <!-- ex, map f = foldr ((:) . f) [] -->

==Example==

For example, if we define in [[Haskell (programming language)|Haskell]] a function <code>square</code> as follows:

<source lang="haskell">