Swift 4.0 废弃的柯里化

// 柯里化 

// http://www.jianshu.com/p/6eaacadafa1a                               Swift 2.0 柯里化方法 (废弃)

// http://www.swifthumb.com/thread-16079-1-1.html                      Swift 3.0 柯里化常用方法推荐

// http://www.ruanyifeng.com/blog/2012/04/functional_programming.html  函数式编程

/*

 Curried function declaration syntax func foo(x: Int)(y: Int) is of limited usefulness and creates a lot of language and implementation complexity. We should remove it.

 (函数的 currying 特性的使用场景并不大，但他会增加很多语言的复杂性，所以需要删除它)

 */

class Currying

{

    // uncurried:普通函数

    // 接收多个参数的函数（与类相关的函数，统称为方法，但是这里就直接说函数了，方便理解）

    func add(a: Int, b: Int, c: Int) -> Int{

        print("(a) + (b) + (c)")

        return a + b + c

    }

    

    // curried:柯里化函数 --> 本质函数式编程思想

    func addCur(_ a: Int) -> (Int) -> (Int) -> Int{

        return {

            b in

            return {

                c in

                    a + b + c

            }

        

        }

    }

}

 

let curry = Currying()

var number = Currying.addCur(curry)(12)(23)(12)

print(number)

 

// NO.2

let datePrint:(Int)->(Int)->(String)->Void =

{

    month in

    print("(month)月")

    return{

        day in

        print("(day)日")

        return{

            action in

            print("(action)")

        }

    }

}

let actionPrint = datePrint(2016)(11)

actionPrint("写详细")