I like the style this uses to explain the else-if construct. A few fundamental concepts are explained and combined in a way that it not only makes else-if obvio

I like the style this uses to explain the else-if construct. A few fundamental concepts are explained and combined in a way that it not only makes else-if obvious but also anything else using these fundamentals. SICP also uses that style throughout and I love that. Wish I could explain things that well.