Transposing a m x n Matrix Array using JavaScript

Using below script we can transpose an m x n matrix array

<script>
    function transpose(arr) {
        var k = arr.length;
        var l = arr[0].length;
        var arr1 = [];
        var arr2 = [];
        for (var j = 0; j < l; j++) {
            arr1 = [];
            for (var i = 0; i < k; i++) {
                arr1.push(arr[i][j]);
            }
            arr2.push(arr1);
        }
        return arr2;
    }
    var originalArray = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]];
    var transposedArray = transpose(originalArray);
</script>