> no immutable data structures (it does not even have decent non-immutable ones) I'm no newbie to FP (IMHO) but this has me perplexed now.. is there a differen

> no immutable data structures (it does not even have decent non-immutable ones) I'm no newbie to FP (IMHO) but this has me perplexed now.. is there a difference between mutable and "non-immutable" ones, or do you mean to say that JS has neither immutable nor mutables ones? ;)