Create custom iterator for objects

symbol_iterator.js

'use strict';

let idMaker = {
  [Symbol.iterator](){
    let nextId = 8000;
    return {
      next(){
        return {
          value: nextId++,
          done: false
        }
      }
    }
  }
}

let next = idMaker[Symbol.iterator]().next;
console.log(next());

for (let v of idMaker){
  if(v  > 8002){
    break;
  }
  console.log(v);
}