Basics of a Promise

000-promises.js

const https = require('https');

// Constants
const URL = 'https://fakestoreapi.com/products';

const requestParams = {
  url: URL
};

/**
 * Get products list.
 * 
 * @param {Object} requestParams - The URL of the API
 */
function getProductsList(requestParams) {
  const { url } = requestParams; // Get endpoint URL

  let productsList = [];

  // Get products
  const getProducts = new Promise(function(resolve, reject) {
    let products = '';

    const request = https.get(url, (response) => {
      response.on('data', (data) => {
        products += data;
      });

      response.on('end', () => {
        resolve(JSON.parse(products));
      });

      response.on('error', (error) => {
        reject(error);
      });
    });
  });

  // Promise handlers - Promise execution doesn't need a `.then` method call for it to execute.
  getProducts
    .then((data) => {
      data.forEach((product) => {
        productsList.push(product);
      });
      console.log(productsList);
    }, (error) => {
      throw error;
    })
    .catch((error) => {
      console.log(error);
    });
}

getProductsList(requestParams);