JS Design Patterns: Iterator, see more at: https://medium.com/p/b890884326a8

DESIGN_PATTERNS_iteratorPatternExample.js

class Car {
  constructor({ model, year, manufacturer }) {
    this.setYear(year);
    this.setManufacturer(manufacturer);
    this.setModel(model);
  }

  setModel(model) {
    this.model = model;
  }

  setYear(year) {
    this.year = year;
  }

  setManufacturer(manufacturer) {
    this.manufacturer = manufacturer;
  }
}

class CarIterator {
  constructor(carsList) {
    this.list = carsList;
    this.current = 0;
  }

  first() {
    return this.list[0];
  }

  next() {
    return this.list[++this.current];
  }

  isDone() {
    return this.current === this.list.length;
  }

  currentItem() {
    return this.list[this.current];
  }
}

const run = () => {
  const carsList = [
    new Car({ model: "Corolla", manufacturer: "Toyota", year: 2013 }),
    new Car({ model: "Polo", manufacturer: "Volks", year: 2017 }),
    new Car({ model: "Civic", manufacturer: "Honda", year: 2015 }),
    new Car({ model: "Tucson", manufacturer: "Hyundai", year: 2015 }),
  ];

  const carInteratorInstance = new CarIterator(carsList);

  console.log(carInteratorInstance.currentItem(), "currentItem");
  console.log(carInteratorInstance.next(), "next");
  console.log(carInteratorInstance.next(), "next");
  console.log(carInteratorInstance.first(), "first");
  console.log(carInteratorInstance.isDone(), "isDone");
};

run();