rotation-based array spiral traversal

spiralTraversal.js

var spiralTraversal = function(matrix){
  var width = matrix[0].length - 1;
  var height = matrix.length;
  var newMatrix = [];
  var firstRow = matrix[0];

  if (matrix.length === 1) {
    return matrix[0];
  }

  for (width; width >= 0; width--) {
    var rotatedCol = [];
    for (var row = 1; row < height; row++) {
      rotatedCol.push(matrix[row][width]);
    }
    newMatrix.push(rotatedCol);
  }

  firstRow.push.apply(firstRow, spiralTraversal(newMatrix));

  return firstRow;
};