array.js

/* jshint esnext: true */
var array = [1337, 1553, 1224],
  i = 0,
  l = list(),
  item = l.next();
function *list() {
  for (var c = 0; c < array.length; c++) {
    yield array[c];
  }
}

while (!item.done) {
  console.log(item.value);
  if (i % 2 === 0) {
    array.push(i);
  }
  item = l.next();
  i++;
}