Swift学习函数和闭包

概述import UIKitvar str = "Hello, playground"//函数和闭包//func 声明一个函数func greet (name : String, day : String) ->String{ return "hello \(name), today is \(day)"}greet("Bob", "Friday")func getGasPr

import UIKitvar str = "Hello,playground"//函数和闭包//func  声明一个函数func greet (name : String,day : String) ->String{ return "hello \(name),today is \(day)"}greet("Bob","FrIDay")func getGasPrices()->(Double,double,Double){    return (3.59,3.69,3.79)}getGasPrices()func sumof(numbers: Int...)->Int{  var sum = 0    for number in numbers{      sum += number    }    return sum}sumof()sumof(43,45,100)func returnFifteen() ->Int{  var y = 10    func add(){      y += 5    }    add()    return y}returnFifteen()func makeIncrementer() ->(Int ->Int){    func addOne(numbew:Int)->Int{      return 1 + numbew    }  return addOne}var increment  = makeIncrementer()increment(7)func hasAnyMatches(List:Int[],condition:Int ->Bool)->Bool{    for item in List {    if condition(item) {     return true    }    }    return false}func lessthanTen(number :Int)->Bool{    return number < 10}var numbers = [20,19,7,12 ]hasAnyMatches(numbers,lessthanTen)//闭包numbers.map({    (number:Int) ->Int in    let result  = 3 * number        return result})numbers.map({number in 3 * number})sort ([1,5,3,12,21]) { > }

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