I agree that I'd like to have the chance to get really good in a language that I use for a long time. (As long as it's enjoyable, e.g. I wouldn't want to be stu

I agree that I'd like to have the chance to get really good in a language that I use for a long time. (As long as it's enjoyable, e.g. I wouldn't want to be stuck in VB forever.) At one point I worked almost entirely in Java (up until around Java 1.5). Another few years it was mostly PHP. But since then it's been a bit of everything. Useful lessons from learning: - Javascript -> Callback passing for an asynchronous computing paradigm. Object-array duality and prototype-based inheritance. - Ruby -> Rubyists often like to be clever with chaining several functions on one line to do something succinctly. This is kinda like functional programming (operations like map, inject, fold, etc.) but just one small piece of it. Ruby also has lots of metaprogramming magic to make DSLs, but that can bite you really bad when you have to debug RoR GEMs.