5-reject.js

'use strict';

// Task: support rejection with an error, if no more items in
// `items` array are available to return with `.next()`
// Change throwing error to returning rejected Promise.
// Catch error with `.catch` or `try/catch` to handle it.

const iterate = (items) => {
  let index = 0;
  return {
    next: () => new Promise((fulfill) => {
      if (index < items.length) {
        return fulfill(items[index++]);
      }
      throw new Error('No more items to iterate');
    })
  };
};

const electronics = [
  { name: 'Laptop', price: 1500 },
  { name: 'Keyboard', price: 100 },
  { name: 'HDMI cable', price: 10 },
];

(async () => {
  const items = iterate(electronics);
  const item1 = await items.next();
  console.log(item1);
  const item2 = await items.next();
  console.log(item2);
  const item3 = await items.next();
  console.log(item3);
  const item4 = await items.next();
  console.log(item4);
})();