[jingwen]

Real World OCaml. https://realworldocaml.org/v1/en/html/prologue.html

> Real World OCaml is aimed at programmers who have some experience with conventional programming languages, but not specifically with statically typed functional programming. Depending on your background, many of the concepts we cover will be new, including traditional functional-programming techniques like higher-order functions and immutable data types, as well as aspects of OCaml's powerful type and module systems.

It's a nice segue into the world of functional programming if you're not ready to give up on imperativeness just yet.