Functional Programming in JavaScript: Interactive Exercises

You might be interested in "Mostly Adequate Guide" as well. https://drboolean.gitbooks.io/mostly-adequate-guide/

Yeah, I have read that too. That is one of the best sites that I have ever came across explains so neat the FP concepts like Monad and other stuffs.

Here is the actual course of FP from the same author: https://frontendmasters.com/courses/functional-javascript/

I think it would be nice to show the code output even when the question is answered successfully. And it might be nice to show the output / expected output in another HTML element on the page rather rather than in an alert. But this is really nice, and a good introduction to the concepts -- very cool!

I have not done the course, just looked at the first 2 questions, but the output prints to the console, so it was just to open the inspector.

Great site. I used it a few months ago and learned so much

yeah same, came across it sometime earlier this year I think - quite useful.