Nice use of point free form

amazing!!!

Unfortunately the test cases do not match the description. There shouldn't be any negative input values at all.
That said, it seems, that with the current (haskell) tests it is expected to treat negative values like any other value. Zero is only expected if one of the inputs is zero.

I think this kata needs better tests and a more precise description.

Added, thanks!

Added, thanks.

Fixed, thanks.

Python

Which language is this?

The tests mention String class that is not present and causes compilation fail.

In the example test cases, String(a) should be str(a)

I think your last suggestion could go amiss, but I'll remove the tag and add some example tests.

• Remove Haskell tag
• Clarify a range of possible arguments which might be assumed as correct
• Add more tests, including those with wrong arguments, not only with an id and different lists, but with non-list (like 2>>=id) and with more complex function.

What is supposed to be returned on (1,-1) or (-1,1)? I thought it might be zero, according to kata's description. Why am I wrong?