swift闭包简洁到变态

通过 sort 函数闭包的定义和语法优化，展示相同的功能下的每一次优化的闭包实现。

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

func backwards(s1: String, s2: String) -> Bool {

    return s1 > s2

}

// 函数式

var reversed = sort(names, backwards)

// reversed 为 ["Ewa", "Daniella", "Chris", "Barry", "Alex"]

// 闭包式
reversed = sort(names, { (s1: String, s2: String) -> Bool in return s1 > s2 } )

reversed = sort(names, { s1, s2 in return s1 > s2 } )

reversed = sort(names, { s1, s2 in s1 > s2 } )

reversed
= sort(names, { $0 > $1 } )

reversed
= sort(names, >)