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matthieubulte/gist:27f0cb9f3d803e2632e0

Created June 11, 2014 06:41
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cons/car/cdr in swift
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gistfile1.swift
func cdr<L, R>(p: () -> (L,R)) -> R {
let (l,r) = p()
return r
}
func car<L, R>(p: () -> (L,R)) -> L {
let (l,r) = p()
return l
}
func cons<L, R>(l:L, r:R) -> (()->(L,R)) {
return {()->(L,R) in return (l,r)}
}
var list = cons("left", cons("center", cons("right", nil)))
car(list)
car(cdr(list))
car(cdr(cdr(list)))
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