Created
September 6, 2017 23:34
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SKI Combinators in Swift 3
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| func s<A, B, C>(_ f: @escaping (A) -> (B) -> C) -> (@escaping (A) -> B) -> (A) -> C { | |
| return { g in { x in f(x)(g(x)) } } | |
| } | |
| func k<A, B>(_ x: A) -> (B) -> A { | |
| return { _ in x } | |
| } | |
| func i<A>(_ x: A) -> A { | |
| return x | |
| } | |
| func i_<A>(_ x: A) -> A { | |
| return k(x)(()) | |
| } | |
| func i__<A>(_ x: A) -> A { | |
| return s(k)(k(x))(x) | |
| } | |
| // - test - | |
| i(42) | |
| i_(42) | |
| i__(42) |
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