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 Watch the Videos

you can also take a look of some of the video lectures
accompanying the eBook 

Introduction to Functors

Maybe

this is an introduction of Maybe aka Option as a funcitonal way to deal with the Null problem 

Promise as Functor

Identity Monad 

this is an introduction to Monads

Mobirise

Functional Javascript

get the book and the accompanying lectures for the Functor and Monads Chapters

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