Could you try my code: https://www.codewars.com/kata/reviews/557bdf248b12b34231000042/groups/66abc1d9dfbb6d7a3e76d0c4

I'm not sure how you check speed, but I think it should be faster than either.

This is that solution that makes you kick yourself for not thinking of it. Very elegant.

javascript's value mangling is so frustrating. bugs as idiomatic patterns is something I want to run away from these days.

thats a really clever answer , if you dont know enough slice method dont understand anythink , but this answer teach me about slice method deeply , for ex slice method acting floor method if get the float , thanks a lot

( ͡° ͜ʖ ͡°)

Fair enough I guess, each to their own.

I'll take the clearer one and finding out what slice does rather than reading your solution that is much more cluttered and harder to read.

But this returns an array, the kata asked for a string

So elegant!

Please use spoiler flag next time.