That is a good point. Sometimes the code is useful even if it is incomplete. (I have sometimes done such things, taking parts of other programs; more often, I w

That is a good point. Sometimes the code is useful even if it is incomplete. (I have sometimes done such things, taking parts of other programs; more often, I write most of the code myself, but some of it will come from other sources like that. As an example, I found the source code for a JPEG encoder, and modified it to improve the compression and other things. There are many other such cases too.)