More Read reading lens
Try it on a small project
Explore Books, Computers & Technology, Programming Languages with a reading approach that gives the ideas somewhere to go. Pattern matching is satisfying because a small expression can be tested against concrete cases. Keep examples that should match beside examples that should fail and use both to refine your understanding.
The listed 221 pages give a sense of extent; page count alone does not establish depth or difficulty.
A question before you choose
Does the sample explain why an example works, as well as how to reproduce it?
Try this with the topic
Use one listed topic as the starting point for a small working example. Keep a before-and-after result and explain one decision you made.