This Kata was fun. But it had confusing wording regarding the "check" method in the instructions.
It me a while to figure out that check really meant tranffer money to from a user to another user.
Not, check the status. Another way of thinking of it is like "writing a check" to another user.
Maybe use give_money or transfer_money woudld be better names for this method.

I am not sure why but, when i directly put an empty array, [], in the return section for if the array is empty or null, i get a wrong answer for it.
But, when i assign a variable with an empty array and then return said array for my empty or null array. It works.

Why is that?

Edit: I forgot to mention that this is JavaScript.

my code is basically me still hung over from c/c++.
I need to learn to use those fancy functions. :P

ignore the comment regarding s_num = str(num)
I mistakanely thought when debugging that it wasn't converting num to a string but in reality it was and my previous code was incorrect.
I was thinking the print output should have said "9119" instead of 9119 which made me think it was an int.
Hope this clears up any confusion.