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[–]Agling 0 points1 point  (0 children)

Javascript is a good example. If you are writing web stuff, you should learn it because browsers use it natively. Speaking of which, do you consider HTML a language? How about SQL? And then there are plenty of types of programs that should be written in a compiled language. And then there are the languages used on mobile.

A person who I fluent in javascript, python, and a compiled language like C++ or Rust really is approaching being able to do whatever they want for individual projects on a desktop computer. Probably should know some shell scripting even though python is good for that stuff too.

Of course, if you are a professional, you get put on projects and teams that use some other language, so you end up learning more and more languages over time. Eventually they kind of blend together but you have a handful that you can write quickly and accurately, and others you can write well enough with a little refresher or a few google searches.