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| filter 1. (Originally , now also ) A program that processes an input data stream into an output data stream in some well-defined way, and does no I/O to anywhere else except possibly on error conditions; one designed to be used as a stage in a (see ). Compare . 2. () A which takes a and a list and returns those elements of the list for which the predicate is true. In : filter p [] = [] filter p (x:xs) = if p x then x : rest else rest where rest = filter p xs See also . [] |
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