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swift function composition using UTF-8 ring operator
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| infix operator ∘ {} | |
| func ∘<A,B,C>(f:B->C, g:A->B) -> (A->C) { | |
| return compose(f, g) | |
| } | |
| func compose<A,B,C>(f:B->C, g:A->B) -> (A->C) { | |
| return { x in f(g(x)) } | |
| } | |
| func add1(x: Int) -> Int { | |
| return x + 1 | |
| } | |
| func description<P: Printable>(p: P) -> String { | |
| return p.description | |
| } | |
| (description ∘ add1)(3) |
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