The problem is that 8kyu's are wildly inconsistent.
I think 8kyu should be 'return a + b' type exercises, they're supposed to be the easiest here.

oh thanks, that fixed it, might have been rather brash there.

The tests are fine, your code isn't. Don't use global vars, they keep their value between tests.

Javascript works on test but not on attempt, and from the looks of the other comments, I think it's the question that's broken.

Print the input to help you debug your code.

Cannot invoke "java.lang.Boolean.booleanValue()" because "[]" is null???

Java Completions 13392

Java does work.

Hint: Don't forget to check for bad values like null/undefined

^ That's your problem.

java don´t work

I think it's not a 7kyu..