JavaScript

Every lesson runs in your browser — write real code, press Run, and the tasks check themselves. Free, no account needed, with translated notes paired with English.

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1. history A short history of JavaScript Reading and resources
2. usage What JavaScript is used for Reading and resources
3. resources Where to learn more Reading and resources
4. setup Run JavaScript anywhere Reading and resources
5. console.log and comments 01 · 3 required tasks · ★ Video
6. Variables — let and const 02 · 3 required tasks · ★ Video
7. Numbers and maths 03 · 3 required tasks · ★ Video
8. Strings 04 · 4 required tasks · ★ Video
9. Template literals 05 · 3 required tasks · ★ Video
10. Booleans and comparisons 06 · 4 required tasks · ★ Video
11. if / else 07 · 3 required tasks · ★★ Video
12. for loops 08 · 3 required tasks · ★★ Video
13. while loops 09 · 3 required tasks · ★★ Video
14. Functions 10 · 3 required tasks · ★★ Video
15. Arrow functions 11 · 3 required tasks · ★★ Video
16. Arrays 12 · 4 required tasks · ★★ Video
17. Array methods 13 · 4 required tasks · ★★★ Video
18. Objects 14 · 3 required tasks · ★★★ Video
19. Looping over objects 17 · 3 required tasks · ★★★
20. switch 16 · 3 required tasks · ★★
21. Errors, try and catch 18 · 3 required tasks · ★★★
22. Putting it together 15 · 3 required tasks · ★★★ Video

Language reference

/know/reference/javascript