Programmers often discover solutions while explaining a problem to someone else, even to people with no programming knowledge. Describing the code, and comparing to what it actually does, exposes inconsistencies. Explaining a subject also forces the programmer to look at it from new perspectives and can provide a deeper understanding.
Yeah. I’m no programmer but I’ve had it often that I couldn’t find a solution for a problem myself, said ‘fuck it, I’ll have to ask the internet’, and by writing out what my problem was I figured out the solution lol