I think there's a pretty wide continuum of "knowing how to do it" and in a lot of cases you have a pretty good idea what's going on by seeing the code, once it

I think there's a pretty wide continuum of "knowing how to do it" and in a lot of cases you have a pretty good idea what's going on by seeing the code, once it is presented. I'd further suggest that a lot of examples the give on the page are just finishing tedious series where the problem is mostly just typing it all out.