I've got this idea where we would selectively breed dogs with the smallest legs, then the ones with the smallest legs of their litter, and so on and son on over a very long period of time, and in the end we would have a sort of worm-like dog creature.
Copying and pasting example code is good because it is faster, but I don't suggest it because the bad outweighs the good; If you copy and paste it then you don't remember it as well as if you typed it out. Every time I've copy and pasted code I found myself going back and having to type it out relearning the code.
So in my opinion, I highly suggest not copying and pasting code.