interesting thought process.

This last comment has become very sad. Hope its author is fine.

var arr = {}

really cool solution!

bigO() is huge for second one!

very clever, nice work :)

thumbs up @MohLoh !
enjoyable straight logic and concise code

Difficult at the moment

понимаю, русский

Your joke really funny :D

Thanks for showing me how to use the ? conditional operator! You are amazing!

oh lol)
this Kata made me learn about regular expression. Try) it's fun