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JadenGeller/ Mask Filter.swift

Created March 24, 2015 01:20
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Filter an Array with a Boolean Array as a mask
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Mask Filter.swift
func filter<S : SequenceType, T : SequenceType where T.Generator.Element == Bool>(source: S, mask: T, defaultValue: S.Generator.Element) -> [S.Generator.Element] {
return Array(Zip2(source, mask)).map({ (value, include) in include ? value : defaultValue })
}
Raw
Example.swift
let sel = [1,2,3,4,5]
let mask = [false, true, false, true, false]
filter(sel, mask, 0) // -> [0, 2, 0, 4, 0]
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