Rotate-Transform the Two-Dimensional Matrix in js

January 27, 2022

I have to create a function to rotate a two-dimensional matrix of N * N integer elements num times, where if num is positive, the rotation is clockwise, and if not, counterclockwise.

Examples

rotateTransform([
   [2, 4],
   [0, 0]
], 1) /*➞ [
   [0, 2],
   [0, 4]
]*/

rotateTransform([
   [2, 4],
   [0, 0]
], -1) /*➞ [
   [4, 0],
   [2, 0]
]*/

NOTE: I couldn’t even try…

>Solution :

the same problem on edabit, and this was the top solution, IDK why you reposting it here…

function rotateTransform(arr, num) {
  if (num > 0)
    return rotateTransform(arr.map((_, i) => arr.map(x => x[i]).reverse()), num - 1);
  else if (num < 0)
    return rotateTransform(arr.map((_, i) => arr.map(x => x[i])).reverse(), num + 1);
  else
    return arr;
}

console.log(rotateTransform([
  [2, 4],
  [0, 0]
], 1))

console.log(rotateTransform([
  [2, 4],
  [0, 0]
], -1))