Rotate a 2D array matrix by 90 degrees

rotate.js

function rotate(arr) {
   const arrLength = arr.length;

   let matrix = Array.from({length: arrLength}, () => []);
   
   for(let i = 0; i < arr.length; i++) {
      for(let j = 0; j < arr.length; j++) {
         let temp = arr[j][i];
         matrix[i][arrLength - 1 - j] = temp
      }
   }
   
   return matrix;
}