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JadenGeller/ Choose Function.swift

Created March 24, 2015 01:57
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Swift Choose Function
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Choose Function.swift
func choose<S : SequenceType, T : SequenceType, U : SequenceType where U.Generator.Element == Bool, S.Generator.Element == T.Generator.Element>(onTrue: S, onFalse: T, picker: U) -> [S.Generator.Element]{
return map2(Zip2(onTrue, onFalse), picker, { zipped, choice in choice ? zipped.0 : zipped.1 })
}
// Note map2 is defined here: https://gist.github.com/JadenGeller/6f5c5dcb16c39b936d17
Raw
Example.swift
let x = [1,2,3,4,5]
let y = [6,7,8,9,10]
let choices = [false, true, false, true, false]
choose(x, y, choices) // -> [6, 2, 8, 4, 10]
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