utop

There is a work-in-progress second edition of "Real World OCaml" book [1], which has many small but vital updates corresponding to the modern state of OCaml and its infrastructure. Moreover, I recommend checking the Lwt [2] from the beginning for working with multithreading. OCaml Ctypes [3] library for creating FFI stubs without a single line of C and Cstruct [4] for working with C structures. If you want to interact with some Python code or script your OCaml program with Python - you can use Pyml [5] library. OCaml universe also has a good library for numbers crunching and scientific computing (including primitive Machine Learning) - Owl [6]. For writing OCaml instead of JavaScript, it is possible to use BuckleScript [7]. And if you are starting a new project in OCaml - I recommend using the most modern buildsystem - dune [8]. It is ver

I'd say if you ever get the time again, give OCaml another look. The toolchain experience has been improving at a rapid pace! I started to explore OCaml again earlier this year and the day to day tooling around it has felt at par or better than my experience with other languages. Between Opam [1], Dune[2] and utop[3] the "new comer experience" has been really good so far. The editor integration with vim/emacs has been top notch, and visual studio code has turned into a really nice option as well for people who don't like vim/emacs. I'm sure there is still room for improvement, but i'd say its atleast heading in the right direction! [1] https://github.com/ocaml/opam [2] https://github.com/ocaml/dune [3] https://github.com/diml/utop [4] https://github.com/ocaml-ppx/ocamlformat

>Readline is a library that adds a line editor to a REPL. There is a great advanced REPL for OCaml if you need something beyond simple stuff: https://github.com/diml/utop

OCaml is a great language. I'm so glad I was forced to learn at in university. Apart from the language itself, the ecosystem surrounding it is very mature as well. - OCamlbuild is the bee's knees. Configuring complex projects requires just one line in the Makefile - OPAM works wonderfully. No configuration required. Everything just works. - Merlin (https://github.com/the-lambda-church/merlin) is incredible. If you use Vim / Emacs, you owe it to yourself to set it up and have better syntax highlighting, indentation and type information right within your editor. - Approachable online guides to get started. RWO[1] is a fantastic resource and teaches you the good parts right from the start. - Utop (https://github.com/diml/utop) is a very modern, fully-featured REPL (almost as good as IPython) ---------- If you've been thinking of learning OCa

This is also great cheat sheet for someone still getting used to the OCaml syntax. I usually advise people to pretend that double semicolons don't exist for anything but the interactive top level. In source files, you can forget about double semis entirely as long as you just remember to always assign the result of an imperative statement to the dummy "_" name. let _ = print_string "hi" Then you can think of ;;<enter> as merely a fancy way of hitting the return key in the interactive REPL. There's also a way to use a different key mapping (control+enter) instead of ;; in utop, so there would be no reason to even acknowledge the existence of double semis. https://github.com/diml/utop/issues/131

I've seen a ton of great improvements in tooling/ecosystem. - OPAM was already mentioned. - The OCaml to JS compiler has matured and gained a lot of use. Interestingly, I suspect that it can also be used to achieve different types of parallelism than the types that the stock OCaml compilers provide. https://github.com/ocsigen/js_of_ocaml - Merlin is also a fantastic autocompletion plugin for Vim/Emacs. https://github.com/the-lambda-church/merlin VimBox (shameless plug) uses Merlin and is configured to provide "intellisense" style completion (as you type) like Visual Studio. https://github.com/jordwalke/VimBox - utop is perhaps the best top level REPL that I've ever seen. https://github.com/diml/utop (edit: Regarding utop: Normally I dread using a REPL for a statically typed language, but utop actually makes the top level fun and interacti