Node.Js Class Iterator

.js

  [Symbol.iterator]() {
    let index = 0

    return {
      next: () => {
        if (index <= this.items.length) {
          const res = { value: this.items[index], done: false }
          index = index + 1
          return res
        } else {
          return { value: null, done: true }
        }
      },
    }
  }