Your code can't handle the second test (from > to) correctly.

Could you explain, what do you need to clarify?

Oh, thank you for your remarks! For the second one - it's my mistake, ok. But for the first - it's just a name of the kata, the real meaning can be revealed easily from the description as well, can't it? :)

Now it works. Try again.

Fixed.

That's a dumb mistake, thanks :)

It's needed:

1. more testcases;
2. whether we should care about input correctness or not;
3. more detailed description.

But it's rather nice kata, I've enjoyed it!

You're definitely right, I've fixed it. Thanks a lot!

Negative step isn't allowed, that's all about using it :) And I wrote that direction depends on the order of arguments, it can be revealed easily from the description. I don't think there is an issue.

Ok :) But the kata's purpose is not just to replicate pythonic "range" method.

So, what do you think should be fixed?

Nice kata, but it needs some random test cases

Added in Ruby and Python too. Thank you for remark!

Maybe, it could be a function in test section that outputs result "A" letter in multiline way, without any "\n"

Fixed.