wont even let me use shift and pop.. darkness

No, Array.prototype.flat requires node 11, this kata only supports up to node 10.

is array.flat() not supported?

There is no k but p. We don't know which language you're using so it's impossible to know exactly, but in some of them, the logs only displays what you returned and what you should have returned (your_answer should be correct_answer).

p and k are the same value? i'm confused. promt is confusing.

why would u want a None value to return False?

cereal??

the test IS bad though. sometimes it expects a space after \n and sometimes it does not.
I also completed this kata but could not pass the tests because my string doesn't have the same " " as the test, and there was no clear instruction for how he wants that or why it changes betwee values 1 and >1

center around the max value. the max value is already provided.

r is a list. If this list if not empty (ie len(r) > 0) then return first element (r[0]). It not then return integer -1

from a number theory perspective, negative numbers should not be invalid inputs.

a '1' in the 10's column would equal 10.
a '-9' in the 1's column would equal -9
you can combine these to sum 1 in theory.

Or am I wrong?