Not a suggestion. 19.00 == 19.

Seems that this solution can't be used like a common solution, see tests here http://stackoverflow.com/a/34466248/3429127.
That means that you should avoid usage of ">" and "<" in comparator.

There is a preloaded calss called Database with a method login? and also a preloaded class called Validator with the method login, The reason I've added the Databse one and referenced that in the description is because that makes more sense to the kata I've left the Validator in so that solutions already posted will still validate.

I saw it in a few different kata's solutions. I had the same question.. Correct one is to use substraction.

For the true test, we need to be able to pass it [NaN, NaN, NaN, NaN, Batman]

Came here to ask the same question.
This returns a boolean, which I would guess complies only with returning the 1 or the 0?
How exactly does this solution work?

Done! Thanks.

Hey, sorry you're having issues. Let me check that out!

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在这上面遇到中国人，真开心！哈哈

And when it gives a fail/error message, no other useful information was provided.

This sounds like a submission timeout. Could you add the actual error message? If there is none, it's likely a codewars issue and not a kata specific issue. (Also, please mark comments that contain solution related information as spoiler).

Great, do you have some insights how it is flawed? Don't forget to add the language where it's flawed (probably C#, right? Last time I've checked JS/Ruby/Haskell where allright). (Hint mark your comment as "issue" if it's one. Issues/suggestions and questions can be filtered and usually get more attention)

Well thank you for saying so! ;P