Thank you for taking the time to reply!

basically as written, built in function array_sum will be used on call of sum function. You can find documentation of array_sum and you'll see that it waits for array parameter

Im new here so bare with me but how on earth does this work??

Nice

Lovely code

Forgot about a booby trap - dividing null))) With the "for"-loop everything is ok!

make sure you check that n!=0, otherwise you will have an endless loop that would cause the timeout. otherwise, idk either

I wrote same code, but for some reason server timed out, IDK

OMG!Wasted so much time and didn't even think about it! Very clever solution!

you don't have to check every time n !== 0 case. if before everything else,if you check !n case and return, you would reduce execution time and redundancy.Also it's not good practice to mutate input.

very clever

i, uh... nevermind