Lovely when someone answers my exact questions on here :) Much appreciated.

Ta, been asking that myself

Nice one! Like the alias XD

No worries - took me a while to learn how it all works!

Thanks I will next time, didn't realize that the discourse isn't seperated for each language.

Thank you for raising this issue.

I've looked at all the languages and can confirm they match now.

For future posts like this, please state the language and mark your comment as an Issue. It helps a lot.

Resilience? arguments is not an Array; args is. So for future-proofing, when prototype methods may be applied to args in new code, it might be useful. Like the curly braces around the single statement in the for-loop.

These days, of course, you'd just do function add(...args) {}.

What does "var args = Array.prototype.slice.call(arguments);" do?
Why not just call arguments[i] directly, is there a reason behind it?

I forgot it

Description should say "isUppercase() " instead of "is_uppercase()"

I recommend the site https://regex101.com to build/test/learn RegEx.

Tried BigInt in js but get an error on this. "ReferenceError: BigInt is not defined" Really strange. Tried it even in codepen where the same thing works..