It's not just Java either. I worked with one OSX/iOS dev who knew Objective-C inside and out, but knew no other languages and didn't want to learn any others, b

It's not just Java either. I worked with one OSX/iOS dev who knew Objective-C inside and out, but knew no other languages and didn't want to learn any others, because after all you can do anything in Objective-C. I asked him what he used if he just wanted to write a quick little script. "Objective-C." There's something to be said for his kind of mastery of a single language, but it was different from the multilingual culture I'm used to. I wonder if he's using Swift now...