I'll have to muse about what the more dumbed down version would look like (as this version is already quite dumbed down compared to the primary sources). It wouldn't be quite a matter of saying "This code contains an abstraction, this other code doesn't," because (and this is quite important) abstraction is a pattern imposed on code, and not part of the code itself.
We do have a document with a number of examples of true abstraction — written in English, rather than code, in accordance with the above. It's normally reserved for our paying students, but, if you E-mail me, I'll send it to you anyway — my contact information easy to find.
I'll have to muse about what the more dumbed down version would look like (as this version is already quite dumbed down compared to the primary sources). It wouldn't be quite a matter of saying "This code contains an abstraction, this other code doesn't," because (and this is quite important) abstraction is a pattern imposed on code, and not part of the code itself.
We do have a document with a number of examples of true abstraction — written in English, rather than code, in accordance with the above. It's normally reserved for our paying students, but, if you E-mail me, I'll send it to you anyway — my contact information easy to find.