Avoid the callback hell by using promises

promises-no-callback-hell-day-11.js

import { doTask1, doTask2, doTask3 } from './tasks';

export function runCode() {
  return Promise.all([doTask1(), doTask2(), doTask3()])
}

tasks.js

export const doTask1 = () => new Promise((resolve) =>
  window.setTimeout(() => resolve('Task 1')
, 300));


export const doTask2 = () => new Promise((resolve) =>
  window.setTimeout(() => resolve('Task 2')
, 300));


export const doTask3 = () => new Promise((resolve) =>
  window.setTimeout(() => resolve('Task 3')
, 300));