I'm a Scala dev now, but when I was a Java dev, I went and learned Python, then Ruby and Rails. Never left Java (well until I got into Scala) but learning thos

I'm a Scala dev now, but when I was a Java dev, I went and learned Python, then Ruby and Rails. Never left Java (well until I got into Scala) but learning those absolutely changed the way I wrote code, and with respect to web dev finally gave a clear picture that was near impossible to see in the Java ecosystem. (Also using IntelliJ IDEA for the first time in 2002 - opened my eyes as to what was possible for an IDE, and what was possible to do with Java.)