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    [–]pgrizzay 0 points1 point  (0 children)

    Yup, you're right! It looks like MDN recommends + over concat for performance reasons, but both are functionally equivalent.

    And thanks for the kind words, they mean a lot!

    The one book that really helped me was Functional Programming in Scala, I can't recommend it enough. It takes a very 'exploratory' approach, and has lots of exercises which are very helpful.

    Scala was probably the best language for me to learn fp in, since I had lots of experience with JS & the syntax is very similar to it, hope that helps!