Sorted! had to return the recursive call, a bit smarter now :D.. Cheers guys :)..

yep I guess I'm doing some basic mistake that I haven't figured out yet, but got some hints from you.. let me think about it a bit longer, problem must be on my side as no one else reporting this issue.. Thank you both, I'll confirm once solved :D.

Thank you for reply.
Nah, I have this inside my code..

    console.log(result);
    return result;

So it's returning as well..

What am I doing wrong? When I console.log the result is correct, but the test response is undefined :-/. Thank you..

Time: 941ms Passed: 0 Failed: 4 Exit Code: 1
Test Results:
Basic tests
Log
[ 6, 7 ]
Expected: [6, 7], instead got: undefined
Log
[ 0, 1 ]
Expected: [0, 1], instead got: undefined
Log
[ 0, 1 ]
Expected: [0, 1], instead got: undefined
Log
[ 2, 2 ]
Expected: [2, 2], instead got: undefined
Completed in 5ms
STDERR
Unhandled rejection TestError: Expected: [6, 7], instead got: undefined