Learn Ocaml - 10 Code Examples & CST Typing Practice Test
OCaml is a functional, imperative, and object-oriented programming language in the ML family. It features strong static typing, type inference, and a powerful module system, making it suitable for compiler construction, systems programming, and formal verification.
Learn OCAML with Real Code Examples
Updated Nov 20, 2025
Learning Path
Learn functional programming basics
Understand pattern matching and recursion
Explore modules and signatures
Practice functors and polymorphic variants
Build real-world projects and libraries
Skill Improvement Plan
Week 1: Functional programming fundamentals
Week 2: Pattern matching and recursion
Week 3: Modules, signatures, and functors
Week 4: Real-world projects and performance tuning
Interview Questions
Explain type inference in OCaml.
Difference between immutable and mutable data?
What are functors in OCaml?
How does pattern matching work?
Explain tail recursion and why it matters.
Cheat Sheet
let x = 10;;
let rec fact n = if n = 0 then 1 else n * fact (n-1);;
type person = {name: string; age: int};;
module M = struct let a = 10 end;;
let module F(X: SIG) = struct ... end
Books
Real World OCaml by Yaron Minsky, Anil Madhavapeddy, Jason Hickey
OCaml from the Very Beginning
More OCaml: Algorithms, Methods, and Diversions
Functional Programming in OCaml
Developing Applications with OCaml
Tutorials
Learn OCaml
OCaml for Functional Programming
OCaml Module and Functor Tutorials
Real-world OCaml projects
Advanced OCaml programming
Official Docs
OCaml Manual
OCaml Language Reference
OPAM Package Manager Documentation
Community Links
OCaml Discourse
StackOverflow OCaml tag
Reddit r/ocaml
GitHub OCaml projects
OCaml meetups and conferences
Community Support
OCaml Discourse
StackOverflow OCaml tag
Reddit r/ocaml
GitHub OCaml projects
OCaml meetups and conferences
Frequently Asked Questions about Ocaml
What is Ocaml?
OCaml is a functional, imperative, and object-oriented programming language in the ML family. It features strong static typing, type inference, and a powerful module system, making it suitable for compiler construction, systems programming, and formal verification.
What are the primary use cases for Ocaml?
Compiler and interpreter development. Formal verification and theorem proving. High-performance and reliable software. Financial modeling and risk analysis. Systems and network programming
What are the strengths of Ocaml?
High reliability due to static typing. Concise and expressive syntax. Efficient native code compilation. Excellent for formal reasoning and verification. Functional and imperative paradigms combined
What are the limitations of Ocaml?
Smaller community than mainstream languages. Fewer third-party libraries and frameworks. Not ideal for GUI-heavy applications. Steep learning curve for beginners. Interop with other ecosystems can be verbose
How can I practice Ocaml typing speed?
CodeSpeedTest offers 10+ real Ocaml code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.