Ask HN: If you could only code with one language which would it be? 8 years ago
Lisp. With metaprogramming technique I can add any modern paradigm and language features.
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For me it was very helpful to read "CRACKING the CODING INTERVIEW" book and solving tasks from https://www.hackerrank.com/domains/tutorials/cracking-the-co....
Ask HN: Learning Kotlin if you don't know Java 8 years ago
I think that you should learn Java first because of all other Android code is written in Java. It would be hard to stay in isolation without interacting with other third party libraries. All Android ecosystem is written in Java.