JSTests/es6/generators_yield_star_generic_iterables.js

var global = this;

function __createIterableObject(arr, methods) {
  methods = methods || {};
  if (typeof Symbol !== 'function' || !Symbol.iterator) {
    return {};
  }
  arr.length++;
  var iterator = {
    next: function() {
      return { value: arr.shift(), done: arr.length <= 0 };
    },
    'return': methods['return'],
    'throw': methods['throw']
  };
  var iterable = {};
  iterable[Symbol.iterator] = function(){ return iterator; }
  return iterable;
}

function test() {

var iterator = (function * generator() {
  yield * global.__createIterableObject([5, 6, 7]);
}());
var item = iterator.next();
var passed = item.value === 5 && item.done === false;
item = iterator.next();
passed    &= item.value === 6 && item.done === false;
item = iterator.next();
passed    &= item.value === 7 && item.done === false;
item = iterator.next();
passed    &= item.value === undefined && item.done === true;
return passed;
      
}

if (!test())
    throw new Error("Test failed");