JavaScript for Beginners

From your first program to arrays, objects, functions, closures, classes, errors, promises and a final project.

Free16 modules172 lessons47 exercises≈ 18 h

Tests check every exercise: in your browser and in the cloud

Exercises run and are checked right in your browser, so you need nothing installed to take the course. To run the lesson examples on your own computer, set it up in two steps.

1
Install Node.js
The lessons use Node.js 22 or newer: pick the LTS version.
- Download the installer for your system from nodejs.org/en/download and run it.
- The guide Run Node.js scripts from the command line shows how to run a lesson's file.
Install VS Code
Download VS Code: it supports JavaScript out of the box, no extension needed.

Syllabus

Your first JavaScript programTheory
Errors in a programTheory
Quiz — an unknown nameQuiz
Your first functionTheory
Order of calculationTheory
Quiz — a function callQuiz
Exercise: rectangle perimeterExercise

Set up your computer

Install Node.js

Install VS Code

Syllabus

01First program≈ 30 min7 lessons

02Variables and types≈ 50 min9 lessons

03Operators and type conversion≈ 1 h 15 min14 lessons

04Conditions and loops≈ 1 h 25 min13 lessons

05Functions≈ 50 min10 lessons

06Scope≈ 35 min8 lessons

07Strings≈ 1 h 25 min12 lessons

08Arrays≈ 1 h 25 min13 lessons

09Array methods≈ 1 h 25 min12 lessons

10Objects≈ 1 h 20 min13 lessons

11Map, Set and JSON≈ 1 h9 lessons

12Closures and this≈ 1 h 20 min11 lessons

13Classes and prototypes≈ 1 h 20 min12 lessons

14Errors≈ 1 h 5 min10 lessons

15Asynchronous code≈ 55 min12 lessons

16Final project≈ 1 h7 lessons