Every language has idiosyncrasies. IMO it's tough to use a language effectively without knowing them, even if you don't use them. I mean, imagine trying to use

Every language has idiosyncrasies. IMO it's tough to use a language effectively without knowing them, even if you don't use them. I mean, imagine trying to use Ruby and not knowing about implicit return values. Or the obscure array slice operations in Python. Every language has its own funky things.