if len(words) > 49: ?

works = True

same

Holy moly

This solution is for old kata without parenthesis.

If you want to add methods to Array.prototype, make sure they are not enumerable. ( Look up Object.defineProperty on MDN. )

Adding enumerable methods there is not good practice, and I don't blame a test suite for not specifically guarding against that. If you want to use that ( perfectly valid! ) JavaScript feature, do it correctly - or suffer the consequences.

Bruh this solution is so simple compared to mine

It would really, really help if you post what language you're having this problem with, and ( properly marked up and spoilered ) your code. Help us help you!

Yes I modified Array prototype.
I modified my function and finally submitted my solution :)

Read smolen's and adityavkk's post below, maybe you're adding something to array prototype like them?

That's not a good practice

No, I didn't. I'd have to change the task to make expected output > input. And all current solutions would be invalid.

Did you change the tests ? I'm sure it was 1 :/

How do you mean? Expected output for 0 is -1.