Created
June 11, 2014 06:41
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cons/car/cdr in swift
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| 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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