[captainbland]

Languages are moving so fast recently that mastery is something of a moving target in a lot of cases. Often using different languages can give you a better insight into how features in other languages can be used - e.g. learning OOP/classes while managing all the complexities of C++ can leave you slightly confused about the whole thing, but if you go learn some Java where it's forced on you, it makes a lot more sense in C++.