In JavaScript, there exist many ways by which one can swap two array elements. In this article, we will discuss a way in which one can swap two array elements in JavaScript in a single line. The input and output would be as follows.
Input: arr = { 10, 20, 40, 30 }
Output: arr = { 10, 20, 30, 40 }
// Swapped 30 and 40
Approach: Using Destructuring Method
This is a far better method than anyone. This method can be executed in a single line. This swapping can be done by writing the 2 array elements and want to reverse in order and in square brackets on the left-hand side. On the right-hand side, we will write the same array elements but this time in reverse order. We can also create a reusable function that can swap the specified index of the array.
Syntax:
[a[m], a[n]] = [a[n], a[m]]
// Where m and n are the index numbers to swap
Example 1: In this example, we will swap two number array elements in a single line using JavaScript.
Javascript
let arr = [1, 2, 3, 5, 4];// Swapping element at index 3 with// index 4[arr[3], arr[4]] = [arr[4], arr[3]];// Print the arrayconsole.log(arr); |
[ 1, 2, 3, 4, 5 ]
Example 2: In this example, we will swap two string array elements in a single line using JavaScript.
Javascript
let arr = ["e", "b", "c", "d", "a"];// Swapping element at index 0 with// index 4[arr[0], arr[4]] = [arr[4], arr[0]];// Print the arrayconsole.log(arr); |
[ 'a', 'b', 'c', 'd', 'e' ]
