Take 2 days to solve it!! Should This Kata be 7kyu?
Finally I solved it using recursion inside nested function.

I think some time we should skip this wasting of times and go next level!

I Update this : num_pill == 1 To: num_pill <= 1. That because if the number of pillars is negative the code will be executed and they will return the distance between the first and last pillar with a negative value and that is not logic.

But if We want to work width : num_pill == 1 => we can enter the absolute value so the number of pillars will be positive even though the input is negative : Math.abs( num_pill ).

Thanks for your attention!

I don't know why do you check if the data type is an object!
You don't need to check the data type, that because the object store all data type. In addition the kata will return an object!