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Re:Functional Programming in JavaScript: Interactive Exercises by girishso on Saturday November 14, 2015 @01:18AM (#10564719)
You might be interested in "Mostly Adequate Guide" as well. https://drboolean.gitbooks.io/mostly-adequate-guide/
Re:Functional Programming in JavaScript: Interactive Exercises by antoaravinth on Saturday November 14, 2015 @08:08AM (#10565529)
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/