You must learn JavaScript 
JavaScript isn't really important for non-web development.  I used to program video games for hand held consoles and JavaScript was the last thing on my mind.Okay, maybe I was working for the unmentioned 1% (and for what it's worth, the company I currently work for uses JavaScript).  And really, it's not a bad idea to learn JavaScript - it's pretty ubiquitous and chances are you will work for a company that uses it at some point in your career.  But honestly, I'm getting a little sick of all these articles that seem to forget that there is more to programming than web apps.Edited to remove snarkiness.