Question

我有一个这样的数组：

let arr = ["one", "two", "three", "four", "five"]

现在我想创建一个基于第一个但只包含特定范围（如1到3）的新数组，结果是：

let arrFiltered = ["two", "three", "four"]

我知道有一个.filter方法，但我无法找到如何从数组中过滤掉一系列元素。

Answer 1

您可以将下标与范围一起使用，它会生成一个ArraySlice，您可以使用Array初始化程序将其转换回数组：

let arr = ["one", "two", "three", "four", "five"]

let result = Array(arr[1...3])  // ["two", "three", "four"]

Answer 2

var listOfNumbers = [1,2,3,10,100] //数组数组

listOfNumbers[0] // 1
listOfNumbers[1] // 2
listOfNumbers[2] // 3
listOfNumbers[3] // 10
listOfNumbers[4] // 100
//listOfNumbers[5]// this gives an error uncomment this line to see it

listOfNumbers[1...2] // [2, 3] this is a subsequence of the original array

Swift：从数组中过滤特定范围的元素

2 个答案: