fighter

n 1: someone who fights (or is fighting) [syn: {combatant}, {battler},

{belligerent}, {scrapper}]

2: a high-speed military or naval plane designed to destroy

enemy aircraft in the air [syn: {fighter aircraft}, {attack

aircraft}]

3: someone who fights for a cause [syn: {champion}, {hero}, {paladin}]

filter

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}]