edit: of course I meant that cloning isn't a consideration in IMmutable languages and that JS is NOT very good as a functional language... oh boy. Annnd anothe

edit: of course I meant that cloning isn't a consideration in IMmutable languages and that JS is NOT very good as a functional language... oh boy. Annnd another nice thing is consider code like this: perform_some_action_with_object(user) user.i_hope_user_hasnt_changed() In mutable languages we can't be sure that `perform_some_action_with_object` doesn't mutate `user` so we have to check. This isn't even a consideration in immutable languages. Again, not the biggest problems in the world, but it really helps when you want to quickly scan through a codebase you are unfamiliar with. You could also say "don't write code like that" and I tend to agree, but I have seen a lot of code like that in OO codebases in my time. I made sure to double check my spelling this time :D