nice solution

How this one passed, i also had the same sulotion but got timeout on 1200

Will consider using isNan for checks now.

I tried it, but this one is not efficient. Timeout error!

literally tried the same thing and it told me my code may be too inefficient. Fair enough but that's all i got XD

With primitive values (e.g. numbers) it doesn't really matter, because the changes to parameters don't affect anything outside the function scope (they're copies). With reference types (such as arrays or objects) it's different.

I see someone say this so often. I also don't get it why?

I Wrote The Same Solution But Faild in Testing
It Need To Check for undefined and boolean although

why "Mutation of function paramateres" sounds so bad ?
I didn't understand either

Is that bad? Why?
(I'm new =/)

I think we need Math.floor(percent/100), ??