Isn't this less readable and cost more or am I wrong? Asking because I am genuinely curious and still learning.

Damn, you ain't had to call him a creep

No let?

This looks so much harder to read than a normal for loop with an if statement inside of it.

The link is broken :(

I know it's trivial, but how is mutating the original arrays being accepted as a valid solution?. Likewise for most of the other answers here

wah wah awesome!

No const ?

Description does not ask for validation. Test cases do not have invalid inputs. Beware of feature creep.

Beautiful!

Hhahaha.. you made it so simple :)

this shit unreadable bruh

why this solution is "Best Practices"?
variables firstNames and lastNames becomes global!

You're welcome. :)

thanks for your explanation!