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Do yourself a favor (if you want to be a web developer):

Understand JavaScript deeply.

Write your applications in TypeScript.

It’s a bit dated, but read “JavaScript, The Good Parts”. Also, check out the Ramda.js library, which brings quite a few good functional programming (FP) techniques to JS.

Function scope is good.

Closures are good.

Higher order functions are good.

Partial function application is good :-)

Warning: if you get too used to FP style programming in JS, Java will feel quite painful afterward.

Eloquent JavaScript is probably what you are looking for: http://eloquentjavascript.net