Transpose of a two-dimensional array - JavaScript

Transpose

The transpose of a matrix (2-D array) is simply a flipped version of the original matrix (2-D array). We can transpose a matrix (2-D array) by switching its rows with its columns.

Let’s say the following is our 2d array −

const arr = [    [1, 1, 1],    [2, 2, 2],    [3, 3, 3], ];

Let’s write the code for this function −

Example

Following is the code −

const arr = [    [1, 1, 1],    [2, 2, 2],    [3, 3, 3], ]; const transpose = arr => {    for (let i = 0; i < arr.length; i++) {       for (let j = 0; j < i; j++) {          const tmp = arr[i][j];          arr[i][j] = arr[j][i];          arr[j][i] = tmp;       };    } } transpose(arr); console.log(arr);

Output

The output in the console: −

[ [ 1, 2, 3 ], [ 1, 2, 3 ], [ 1, 2, 3 ] ]