I have dealt and used JavaScript and am quite comfortable with it. However I was wondering if I should learn another one. Is there another language out there that used more widely or has more use in the business industry? And could you also recommend a good book for it?
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Yes, you surely should.
I don’t know. Why don’t you pick one related to your expertise? Or something wildly different from what you know.
Go to the library or a book shop. Flip some books through. Most likely, one of those books is good enough. But nothing beats learning to look up API reference on the net.
EDIT: Question from the comments:
You can use the TIOBE Community Index to look up popular programming languages. However, you shouldn’t use that as a deciding factor as things may differ locally to you. I’ve never done C professionally (which is apparently the most “popular” language according to TIOBE), so it all depends on what you want to do.