How do you swap 2 elements in an array, in JavaScript?

如何在JavaScript中交换数组中的2个元素？

Suppose we have an array a which contains 5 letters.

假设我们有一个包含5个字母的数组a 。

const a = ['a', 'b', 'c', 'e', 'd']

We want to swap element at index 4 (’d’ in this case) with the element at index 3 (‘e’ in this case).

我们希望将索引4的元素(在这种情况下为'd')与索引3的元素(在这种情况下为'e')交换。

We can use a temporary item tmp to store the value of #4, then we put #3 in place of #4, and we assign the temporary item to #3:

我们可以使用临时项目tmp存储＃4的值，然后将＃3替换为＃4，然后将临时项目分配给＃3：

const tmp = a[4]a[4] = a[3]a[3] = tmp

Another option, which does not involve declaring a temporary variable, is to use this syntax:

不涉及声明临时变量的另一个选项是使用以下语法：

const a = ['a', 'b', 'c', 'e', 'd'];[a[3], a[4]] = [a[4], a[3]]

Now the array a will be correctly ordered as we want.

现在，数组a将根据需要正确排序。

a //[ 'a', 'b', 'c', 'd', 'e' ]

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