1. (Originally Unix, now also MS-DOS) 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 pipeline (see plumbing). Compare sponge. 2. (functional programming) A higher-order function which takes a predicate and a list and returns those elements of the list for which the predicate is true. In Haskell: filter p [] = [] filter p (x:xs) = if p x then x : rest else rest where rest = filter p xs See also filter promotion. [Jargon File]

In addition suitable contents:
[ 2 ] [ = ] [ ag ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ arg ] [ as ] [ at ] [ b ] [ be ] [ bi ] [ C ] [ ca ] [ cat ] [ ch ] [ co ] [ con ] [ D ] [ data ] [ de ] [ design ] [ do ] [ DOS ] [ du ] [ ed ] [ ee ] [ element ] [ er ] [ error ] [ es ] [ et ] [ fi ] [ file ] [ filter promotion ] [ fo ] [ for ] [ function ] [ functional ] [ functional program ] [ functional programming ] [ ge ] [ gh ] [ gi ] [ gn ] [ gr ] [ h ] [ hat ] [ higher-order function ] [ hose ] [ hr ] [ id ] [ il ] [ in ] [ input ] [ int ] [ io ] [ I/O ] [ is ] [ it ] [ J ] [ Jargon File ] [ ke ] [ Lex ] [ li ] [ line ] [ list ] [ ls ] [ lt ] [ lu ] [ ly ] [ M ] [ mm ] [ mo ] [ mod ] [ module ] [ mp ] [ MS-DOS ] [ na ] [ nc ] [ ne ] [ ng ] [ ni ] [ no ] [ np ] [ ns ] [ O ] [ om ] [ OS ] [ output ] [ pa ] [ pe ] [ ph ] [ pipe ] [ pipeline ] [ pl ] [ plumbing ] [ pr ] [ process ] [ program ] [ programming ] [ pt ] [ query ] [ rc ] [ re ] [ ro ] [ ru ] [ S ] [ se ] [ si ] [ sig ] [ sk ] [ so ] [ sponge ] [ st ] [ stream ] [ tag ] [ th ] [ to ] [ tp ] [ tr ] [ um ] [ us ]