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Rotating a 2-D (transposing a matrix) in 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.
Example
The code for this will be −
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 ] ]
Updated on 15-Oct-2020 09:19:12
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