It has happened a few times that I have answered a question where the OPauthor is doing things in a round-about and complicated way. I tell OPauthor that there is a better way and show them how using a short snippet with the general approach, showing key ideas and solutions. And oft timesoftentimes, I leave the dotting of i's and crossing of t'srest to the OPauthor.
Most of the time, the OPauthor appreciates the review, and gogoes about improving their code merrily. But every now and then there is someone that insists I provide a complete working, tested implementation for them. When this happens I feel as if I'm being used as a free-of-charge contractor. And I tell them (albeit in a more polite manner) that:
I'm not your contractor, figure it out.
The question I want to ask meta is, is it OK to do a review and not give a fully working implementation, i.e. with "some assembly required"? Or can I expect the OPauthor to fill in the blanks if I show them the way?