Functional-Light JavaScript
Kyle Simpson's CC BY-NC-ND 4.0 take on functional programming for working JS developers — composition, immutability, currying, recursion, and list-operation idioms, without category-theory weight. Drills lift Simpson's example code (MIT) and let learners fill in the primitives by hand.
- JavaScript
- 23 lessons
- ~5 hours
- Free
- by Kyle Simpson
Learn JavaScript for free on Libre Academy with the Functional-Light JavaScript course: 23 interactive lessons you complete by writing real code in a built-in editor, graded instantly by hidden tests. No paywall, no sign-up — it runs in your browser and the free desktop app.
What you get
- Hands-on lessons with a real editor and instant, test-graded feedback.
- Free and open source — no account required to start.
- Runs in your browser, and offline in the free desktop app.
- JavaScript runs in your browser.
What's inside
- Why Functional Programming?
- The Nature of Functions
- Managing Function Inputs
- Composing Functions
- Immutability and Side Effects
- Recursion
- List Operations
- Functional Async
- Putting It All Together
Start Functional-Light JavaScript free → More free JavaScript courses