changed

added

Not a kata issue, read the error message:

TypeError: xs.includes is not a function

includes is an array method, and the input could be some other data types too.

"don't use numpy" ? x)

I believe it's a problem of installed versions that differ between CW and what you have at your place. Try this:

• print something to the console just before the return statement (but do return only a variable, don't put any statement in the return line)
• if you see the statement in the console, that means the error comes from the assertion process. In that case, just convert your numpy array to a regular list before returning it. (edit: oh, but you have to return string, right. So next point, I guess)
• if not, that means you do a boolean check somewhere. Then apply what's recommanded in the error message.

You have to return a string.

problem corrected

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Fixed

Problem confirmed for the sample tests. It works with the test cases (at least if the code is right and there is no assertion message to display).

Why do you think this is correct?

Every day is a new day, you should be able to solve this tomorrow ;-)