IterableIterator.js

class IterableIterator {
  constructor(obj){
    this.index = 0
    this.data = Object.keys(obj).map((key) => { return { [key]: obj[key] } })
  }
  next = () => {
    if(this.index < this.data.length){
      return { value: this.data[this.index++], done: false }
    } else {
      this.index = 0
      return { value: undefined, done: true }
    }
  }
  [Symbol.iterator] = () => {
    return { next: this.next }
  }
}