Pascal's Triangle in JavaScript

pascals-triangle.js

var pascalsTriangle = function(width) {
  var i   = -1
    , set = []
    , prev;
  if (width > 1) {
    prev = pascalsTriangle(width - 1);
  }
  while (++i < width) {
    if (prev && prev[i - 1] && prev[i]) {
      set.push(prev[i - 1] + prev[i]);
    } else {
      set.push(1);
    }
  }
  console.log(set.join(' '));
  return set;
};