Wow.

Beautiful

By using the char codes? (I came up with a very similar solution)

Correct me if I am wrong, This does not pass n = 0 test, does it?

Nice solution

I find it neater if you replace i > 0 ? by just i ?

he just wanna code in one raw lol

It has been said, "The blues live in the notes you don't play"

Remember not only to say the right thing in the right place, but far more difficult still, to leave unsaid the wrong thing at the tempting moment.

Don't say much, do ya? ;)

Every iteration you are recalculating word.split('').sort().join('') instead keep it stored outside the filter

beautiful solution!

best solution in this kata

Almost my answer, but...
return !parens.lenght

so finally i learn how index work in map :-)