Unfinished Modular iterator

ModularItem.ts

export class ModularItem<E> {

  private readonly _value: E
  private _position = 0

  constructor(value: E, position: number = 0) {
    this._value = value
    this._position = position
  }

  advance() {
    this._position++
  }

  retreat() {
    this._position--
  }

  reset() {
    this._position = 0
  }

  get value(): E {
    return this._value
  }

  get position(): number {
    return this._position
  }
}