Swfit_闭包

var bb:() -> String = {        return "ddf"    }

func closeBlock() {        //sorted 参数必须是字符串        let names = ["Cat", "Apple", "Egg", "Block", "Dog"]        //倒序        var reversedNames = names.sorted(by: { (s1: String, s2: String) -> Bool in            return s1 > s2        })        let reversedNames2 = names.sorted { s1, s2 -> Bool in return s1 > s2}  //简写                        //顺序        var sequenceNames2 = names.sorted(by: { (s1: String, s2: String) -> Bool in            return s1 < s2        })        let a = names.sorted { (s1: String, s2: String) -> Bool in            return s1 < s2        }        let b = names.sorted { s1, s2 -> Bool in return s1 < s2}  //简写        let d = names.sorted(by: { $0 > $1 } ) //简写 , $0 代表string1  $1代表 string2        let c = names.sorted()                    }