You don't have to use JavaScript, you can pick whatever language you feel comfortable with, and just learn it and start writing code with that language.
The only constraint you have, with JavaScript, is that you have to know it, if you work on the web apps world.
But working on web apps is not mandatory either, just like using JavaScript.
I think to learn another programming language will be beneficial for you in any case, and can help you to have some degree of comparison.
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You don't have to use JavaScript, you can pick whatever language you feel comfortable with, and just learn it and start writing code with that language.
The only constraint you have, with JavaScript, is that you have to know it, if you work on the web apps world.
But working on web apps is not mandatory either, just like using JavaScript.
I think to learn another programming language will be beneficial for you in any case, and can help you to have some degree of comparison.