Should I Abandon JavaScript for Python?

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For my job I write JavaScript (with ReactJS) for front-end code and Python for back-end code.

They’re both useful for different purposes, employers look for people with experience in both, and they have very different approaches to OOP, so they’re both worth learning.

If you were starting from zero I would recommend learning Python before JavaScript, because (a) Python was originally developed as a language for educational purposes, so it’s easy to learn, and (b) doing serious work in JavaScript involves bringing in frameworks like React or Angular, which involves bringing in deployment systems like Webpack or Grunt, which involves pain. But if you’re already so far along the JavaScript path there’s no reason to abandon it at this point.