[rafark]

I get what you're saying and that's one of the reasons the code should be deeply analyzed when you're learning, many times you'll find the answer to why that particular approach was selected. Very often authors point out why other approaches aren't suitable for that speciic purpose, many times theorically or by using abstract concepts.

[inimino]

Analysis here can also mean rewriting it yourself from scratch (perhaps in high-level pseudo-code) the next day. If you can't make the same decisions the author did or understand them, then analyze again.