在Swift中可以把函數(shù)當(dāng)參數(shù)傳入，代碼如下

// 函數(shù)類型func biggerFirst(a:Int, b:Int)->Bool {    return a > b}var arr:[Int] = []for _ in 0...50 {    var ramdom = arc4random()%1000    arr.append(Int(ramdom))}arr.sort(by: biggerFirst) // biggerFirst 作為參數(shù)傳入