Posts tagged OCaml
This will be a short PSA to opam package maintainers to avoid spurious optional dependencies. At this point, I think this is all relatively common knowledge. But open source maintainers are as a rule busy people, and without much encouragement, they end up dragging their feet. Therefore I hope this post can be a useful reminder of the negative effects of optional dependencies and what can be done to avoid them.
OCaml programmers don’t seem to resort to free monads much. I like to imagine that this is the case because we’re a practical bunch. But it could simply be that this technique like other monads is a bit heavyweight syntactically, let alone the performance implications it might have.
The process of publishing an opam package has come a long way from its modest beginnings. Nevertheless the opam team deserves praise for choosing an extremely simple and flexible model for contribution - the git commit. To me that explains how it aged gracefully with improvements such as:
ppx has been out for a while but it seems like the community has been taking its time transitioning away from camlp4. There’s probably a couple of reasons for that:
Type safe routing means different things to different people. So let’s start by clarifying the intended meaning in this post. There are 2 widely used definitions:
There is an old and great schism in the OCaml community. The schism is between two concurrency libraries - Async and Lwt. As usual for these things, the two are very similar, and outsiders would wonder what the big deal is about. The fundamental problem of course is that they’re mutually incompatible. The result of this is a split OCaml world with almost no interoperability, and duplication of efforts.
OCaml is my favorite language, but one area where it (its tools rather) often falls short in practice is common string handling tasks where regular expressions are often involved. The kind of stuff that Awk and and scripting languages often get praised for. In other words, not getting in the way and allowing to get the job done with minimal boilerplate.
In my previous post I’ve introduced opium in a beginner friendly way, while in this post I’ll try to show something that’s a little more interesting to experienced OCaml programmers or those are well versed with protocols such as Rack, WSGI, Ring, from Ruby, Python, Clojure respectively.
One itch that I usually need to scratch is setting up quick and dirty REST API’s - preferably in OCaml. OCaml does have a few options for web development but I found them to be not so great fits for my needs. To summarize:
According to opam OCaml has 2 popular libraries for parsing json:
Lately, I’ve been messing around with Janestreet’s core and async libraries by reimplementing an old interview question that has been posed to me before. The problem statement itself is from my memory alone so this isn’t 100% what I’ve been asked but it should be extremely close.