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Because you are first putting it as head.next which means if it IS null, it will already be at head.next and the return will basically return to the pre-recursion of the last function just to get print a null value
What his code does is, if head.next is null, it will return so that head.data will be printed, otherwise, head=head.next will happen and that will be put into the same function
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Because you are first putting it as head.next which means if it IS null, it will already be at head.next and the return will basically return to the pre-recursion of the last function just to get print a null value
What his code does is, if head.next is null, it will return so that head.data will be printed, otherwise, head=head.next will happen and that will be put into the same function