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class UserCollection {
  constructor(users) {
    this.users = [].concat(users);
  }
  [Symbol.iterator]() {
    let i = 0;
    let users = this.users;
    return {
      next() {
        if (i < users.length) {
          return { done: false, value: users[i++] };
        }
        return { done: true };
      }
    };
  }
}
let users = new UserCollection([
  { first: 'Yehuda', last: 'Katz' },
  { first: 'Tom', last: 'Dale' },
  { first: 'Taylor', last: 'Otwell' }
]);
for (let user of users) {
  console.log(user);
}
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