Swift 数组

        // 初始化一个数组
        let array1 = [Int]()
        print(array1)
        
        // [String]
        let strArray = ["aa", "bb", "cc"]
        print(strArray)
        
        // [Int]
        let numArray = [1, 2, 3, 4]
        print(numArray)
        
        let p = CGPoint(x: 10, y: 20)
        // [CGPoint]
        let pointArray = [p, p]
        print(pointArray)
        
        // any
        let array:Any = ["aa", 1, p]
        print(array)

        let array = ["aa", "bb", "cc"]
        
        print("---- 1、按照下标遍历")
        for i in 0..<array.count {
            print(array[i])
        }
        
        print("---- 2、for in 遍历数组")
        for s in array {
            print(s)
        }
        
        print("---- 3、enum block 遍历，同时遍历下标和内容")
        for e in array.enumerated() {
            print("\(e.offset)  \(e.element)")
        }
        
        print("---- 4、enum block 遍历，同时遍历下标和内容2")
        for (nnn, sss) in array.enumerated() {
            print("\(nnn)   \(sss)")
        }
        
        print("---- 5、反序遍历")
        for s in array.reversed() {
            print(s)
        }
        
        print("---- 6、错误的反序遍历索引和内容")
        for (n, s) in array.reversed().enumerated() {
            print("\(n)   \(s)")
        }
        
        print("---- 7、正确的反序遍历索引和内容")
        for (n, s) in array.enumerated().reversed() {
            print("\(n)   \(s)")
        }

        var array = ["aa", "bb", "cc"]
        
        // 增加元素
        array.append("dd")
        print(array)
        
        // 修改元素
        array[0] = "oo"
        print(array)
        
        // 删除元素
        array.remove(at: 3)
        print(array)
        
        // 删除所有元素
        array.removeAll();
        print(array)
        // 删除所有元素，保留空间
//        array.removeAll(keepingCapacity: true)

        var array: [Any] = ["aa", "bb", "cc"]
        let array1: [Any] = ["xx", "yy", 11]
        // 注意，要合并的数组必须类型一致
        array += array1
        print(array)