Swift中数组的运用

//数组写法

var array = [1,2,3]
var array1:Array = [1,2]
var array2:Array<Int> = [1,2]

var array3:Array<Any> = [1,"2",2.1]

 //数组访问和插入
var array4:[String] = ["a","b","c"]

print(array4[0])

array4.insert("d",atIndex:3)

//数组的删除和修改

var array5: = [1,2,3,4,5]
array5[0] = 9

array8.removeLast() //删除最后一个元素

array8.removeAtIndex(2)//删除指定位置的元素

array.removeRange(Range(0...3))//删除指定位置指定长度的元素

array8.removeAll(keepCapacity: true)//keepCapacity是否保持容量

//数组的批量操作

var array10 = [1,2,3,4,5]

array10[0...1] = [9] //把0到1索引位置的值 换成9

array10[0...1] = [9,9,9,9,10,3]//把0到1索引位置的值 换成[9,9,9,9,10,3]

array10.replaceRange(Range (start: 0, end: 2), with: [0,0,0])//批量替换

array10.replaceRange(0..<2, with: [999,990,837])
 

var array = [1,2,3,4,5,6]

array += [1,2,3] //在数组的最后开始加

array += array[0...2]

//数组的遍历

var array:Array<Int> = [1,2,3,4,5,6,7]

for var index = 0; index<array.count; index++ {

    print(array[index])

}

for number in array {

    print(number)

}