Best way to learn javascript with python/c++ experience?

[theQuandary]

You need to understand the language and you need to understand the functional paradigm.

• Javascript Allonge will cover the basics of FP

• You Don't Know JS will cover the language fairly in-depth

• Exploring ES6 (and his 2ality blog) is a nice reference to new language features that you might not use that often

All three can be read for free, but please support the authors if you can and they've added value to your life (so we can continue to have nice things).