ES6 array iterator using generator

arrayIterator.js

/**
 * let it = arrayIterator(['foo', 'bar', 'baz']);
 * it.next().value; // "foo"
 * it.next().value; // "bar"
 * it.next().value; // "baz"
 * it.next().value; // undefined
 */
function* arrayIterator() {
  let array = arguments;
  let index = 0;
  yield* array[index];
  index++;
}