Swift Array的高级使用

开发过程中使用数组的概率非常高，这里对部分功能做一个介绍，使用playground去显示，打印出来的内容我就不一一写上去了，真的很有用！

//: Playground - noun: a place where people can playimport UIKit//数组问题struct student {    var name = "123"    }var str = "Hello, playground"//将多个数组合成一个数组let array = [[1,2,4,],[3,5],[565,33]]//let arrayMap = array.map{$0}let arrayFlat = [[123,123],[444]].flatMap{ $0 }PRint(arrayFlat)//分离出条件内的数字并和成数组let arrayFilter = [1,2,3,4,5,6,20]let tempFilter = arrayFilter.filter{ $0 % 2 == 0 }print(tempFilter)//获取数组的和let sumArray = [2,3,5,6,7]let tempSum = sumArray.reduce(0){ $0 + $1}print(tempSum)//从类里面遍历出来var oneS = student.init()oneS.name = "1"var oneS1 = student.init()oneS1.name = "2"var oneS2 = student.init()oneS2.name = "3"let students = [oneS,oneS1,oneS2]let endS = students.filter { (student) -> Bool in    return student.name == "2"}if let endA = endS.last {    print(endS.last)}//取出空数组let nilArray = [[],[23,322],[4,3,4],[],[666,777],[]]let tempNilArray = nilArray.filter { (array) -> Bool in    return array.count > 0}print(tempNilArray)//forEach遍历数据let testArrA = [1,4,5,6,1]let testArrB = [1,2,3,4,5]let testArrC = ["a","b","c","D"](2..<testArrA.count).forEach { (countT) in    print(countT)}//遍历testArrC.enumerated().forEach { (oneStr) in    print(oneStr.element)}//从某一点这个点开是，分离成两个数组，并去掉当前的元素testArrA.split(separator: 4)testArrC.split(separator: "b")//条件分离testArrA.split { (tempInt) -> Bool in    return tempInt <= 1}//删除索引之前的对象testArrC.dropFirst(0)testArrC.dropLast(1)//修改数组元素内容print(testArrC.map{$0.lowercased()})//排序print(testArrC.sorted(by: < ))print(testArrB.sorted(by: < ))//倒序print(Array(testArrA.reversed()))//prefix,取前几位的值print(testArrA.prefix(3))//suffix，取后几位的值print(testArrA.suffix(1))// 运算符重载func == (stu1: student,stu2: student) -> Bool {    if stu1.name == stu2.name {        return true    }    return false}let isEqual = oneS1 == oneSlet threeArr = [1] + [3] + [1,0,88]let befor = 1let later = ~1print(later)//枚举enum WeekType {    case One    case Two}
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