I passed the test but I get two errors when I attempt the solution. The problem is, I don't know what the inputs are. I am unable to debug the test at this point. Printing the console log does not help as it does not clearly show which ones are arrays among the test inputs. Maybe I am unclear about the expected results of sparse array but at this point I find it difficult to debug my code. Does anyone have a useful tip or pointer that could help me?

FIRST ERROR:
Should return a split array: [[null],[null,null,0,""],[[null,null,null],[]]]
Log
Given array: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,, END OF GIVEN
Result: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

SECOND ERROR:
Should return a split array: []
Log
Given array: 1,2,,3,4,,5,6,,7,8,,9 END OF GIVEN
Result: 1,2,3,4,5,6,7,8,,9

Got it. Thanks dude

This message means that for some test case, your solution returned false while it should return true.

Do you know what input makes your solution fail? If not, see here how to print function arguments, and then recreate the failing test case locally and debug through it in your IDE.