SwiftzSwift函數(shù)式編程
Swiftz 是一個(gè) Swift 庫(kù),實(shí)現(xiàn)了函數(shù)式編程。
示例代碼:
let xs = [1, 2, 0, 3, 4]
// we can use the Min semigroup to find the minimal element in xs
sconcat(Min(), 2, xs) // 0
// we can use the Sum monoid to find the sum of xs
mconcat(Sum<Int8, NInt8>(i: { return nint8 }), xs) // 10
// we can delay computations with futures
let x: Future<Int> = Future(exec: gcdExecutionContext, {
sleep(1)
return 4
})
x.result() == x.result() // true, returns in 1 second
// we can map and flatMap over futures
x.map({ $0.description }).result() // "4", returns instantly
x.flatMap({ (x: Int) -> Future<Int> in
return Future(exec: gcdExecutionContext, { sleep(1); return x + 1 })
}).result() // sleeps another second, then returns 5評(píng)論
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