How to Rotate a 2D Array of Integers

Question

I am programming a Tetris clone and in my game I store my tetromino blocks as 4x4 arrays of blocks. I now need to be able to rotate the integer positions in the arrays so th

Answer 1

js code for both clockwise and counter-clockwise:

function arrRotation90(arr, clockwise) {
            var arr_rotated = [];
            for (var i = 0; i < arr[0].length; i++) {
                arr_rotated[i] = [];
            }
            if (clockwise) {
                for (var i = 0; i < arr.length; i++) {
                    for (var j = 0; j < arr[i].length; j++) {
                        arr_rotated[arr[i].length-1-j][i] = arr[i][j];
                    }
                }
            } else {
                for (var i = 0; i < arr.length; i++) {
                    for (var j = 0; j < arr[i].length; j++) {
                        arr_rotated[j][arr.length - 1 - i] = arr[i][j];
                    }
                }
            }
            return arr_rotated;
        }