You are correct, I changed the comparison symbol and the problem became correct. The error is in the problem itself.

Super explanation, thank you for this - I was going slightly mad.

I solved using a for loop 😆

i agree with you ! i'm using js as a beginner and can resolve katas but this one uses the string prototype and not function arguments and so beginners like me don't know how to adapt their answer ! thanks to try to understand us !😅

Every day you rent the car costs $40. If you rent the car for 7 or more days, you get $50 off your total. Alternatively, if you rent the car for 3 or more days, you get $20 off your total.

It's all there, and what you wrote is wrong:

It turns out there is a $40 discount if d >= 7, $20 discount if d < 7 & $40 a day if d < 3.

There is no $40 discount.

I didn't suggest that it should be reranked. I suggested that it should be removed completely and then reposted with a more appropriate kyu.

what's the difference? kyu == rank, amirite

If it's so important for you this kata to be reranked, there is the right place to do it, and not on the Discourse page where nobody can fix this issue: https://github.com/codewars/content-issues

This kata asks only fundamental things: parse a string, check case, change case, build a string. Most languages have well known built-in features who do that. There are a lot more obviously of bad ranked katas. I don't know How many times has it been solved by people learning the fundamentals of coding, neither do you.

Approved katas cannot be reranked. It has been solved more than 27,000 times and it's not a hard one.

Well, not exactly, even when not printing to the console, if the selected Node's version is 8.3 you can see this:

STDERR
Max Buffer Size Reached (1.5 MiB)

You can select a newer version and that message won't appear.

It means you're printing too much stuff to console, most likely running into infinite loop. That is not a kata issue.