The topic "functional programming" (FP) is complex and hard to cover in a session. However, here's what can be done: Oliver uses extracts from real projects to demonstrate solutions that turned out to be extra effective because functional techniques were applied. You'll see well-designed algorithms, useful runtime runtime type information with reusable libraries, and the selective use of Rescript code. Careful: chances are you'll develop an interest in FP and recognize various object oriented ideas as pointless - don't say we didn't warn you!