Swift学习 --- 2.7闭包

这章学的不是很透彻,需要再次学习

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override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]
        
//        func backwards(s1: String, s2: String) -> Bool {
//            return s1 > s2
//        }
//        var reversed = sort(names, backwards)
        
        //1.闭包
        var reversed = sort(names, { (s1: String, s2: String) -> Bool in
            return s1 > s2
            })
        
        //2.根据上下文推断
        reversed = sort(names, { s1, s2 in return s1 > s2 } )
        
        //3.参数名缩写
        reversed = sort(names, { $0 > $1 } )
        
        //4.运算符函数
        reversed = sort(names, >)
        
        println(reversed)
    }

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