Resources to master Object Oriented javascript and javascript coding/programming questions.

I am not sure about programming, but a good book to start is JavaScript - The good parts by Douglas crockford. For interviews I would still do leetcode and solve them in JavaScript.

Why OOP? In large modern companies, everyone uses functional programming paradigm for better modularity and testability. Even popular framework like React promotes composition over inheritance. Rather than OOP, probably you also want to consider the basic js concepts like closure and currying. Those concepts tested more often in js interviews.

For JS interview questions this is my favorite starting point. Really helped with leetcode https://www.udemy.com/js-algorithms-and-data-structures-masterclass/

The book: Professional Javascript by Nicolas C Zakas has been really helpful. He also has a book for ES6. Amongst the online resources I recently came across a website: javascript.info and really liked their format and explanations.