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Filter (higher-order function)
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<p>In <a href="/facts/Functional_programming/cdxqPEIM">functional programming</a>, filter is a <a href="/facts/Higher-order_function/VjnjGbpt">higher-order function</a> that processes a <a href="/facts/Data_structure/yNsNvL1I">data structure</a> (usually a <a href="/facts/List_(data_structure)/9tzhAH6M">list</a>) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given <a href="/facts/Predicate_(computer_programming)/5WazAvKF">predicate</a> returns the <a href="/facts/Boolean_value/0GWYLDoC">Boolean value</a> true. </p>