JavaScript - swap two array elements

In this article, we would like to show you how to swap two array elements in JavaScript.

Quick solution:

const array = ['a', 'b', 'd', 'c'];

const tmp = array[3];
array[3] = array[2];
array[2] = tmp;

or

const array = ['a', 'b', 'd', 'c'];

[array[2], array[3]] = [array[3], array[2]];

Practical example

In the below example, we swap the last two items of array.

// ONLINE-RUNNER:browser;

const array = ['a', 'b', 'd', 'c'];

const tmp = array[3];
array[3] = array[2];
array[2] = tmp;

console.log(array);

without creating temporary variable:

// ONLINE-RUNNER:browser;

const array = ['a', 'b', 'd', 'c'];

[array[2], array[3]] = [array[3], array[2]];

console.log(array);