I wish I could upvote that post more than once ;-)

Missing strictures are one of the most annoying "features" that a programming language can have. It's the reason why I don't like javascript, matlab, lua and PHP.

And closures are one of the things that I didn't miss at first because I couldn't even think of such a thing. Now I'm used to it, and I'm amazed at how much you can do with them.