dream
Rx.NET
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dream
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Ask HN: What Happened to Elm?
> It sounds like you read my statement as "run the exact same code in node or OCaml" which I agree would have been very hard.
Hello! Indeed, I did misunderstand you. I agree that it was possible to share some parts of the code between Reason's JS target with BuckleScript, and native target with the stock OCaml compiler. I think a pretty reasonable number of people did that. Actually, it's still possible to this day even with ReScript e.g. https://github.com/aantron/dream/tree/master/example/w-fulls...
> Between the breaking changes and the general change in development philosophy...switching to the ReScript compiler for my project would have required nearly a complete rewrite.
There were perhaps a couple of minor breaking changes but can you explain why it would have required a near complete rewrite? I wasn't aware of anything major like that. ReScript even supported and as far as I know, to this day continues to support the old Reason syntax.
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Functional Reactive Programming
> you might want to check out OCaml for general purpose programming
Any tips on backend frameworks to look at? I need to write a small websocket service for a side-project and have always wanted to try OCaml. I came across https://github.com/aantron/dream.
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so people are making these
The framework I played around with for OCaml was called Dream: https://github.com/aantron/dream. I think it had built-in support for auth, but I didn't use it in what I was doing. I also barely scratched the surface of what it supported. On the whole, it seemed really nice though. The biggest issues I had were figuring out OCaml since I'd literally never used it before and figuring out how to make an HTTP call from within OCaml since the documentation can be iffy. Thankfully, Dream's documentation was actually reasonably good.
- The New OCaml Website
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Dream – Tidy Web Framework for OCaml and ReasonML
Yes. OCaml + all of the 3 OCaml-to-JS compilers support OCaml syntax.
Dream itself demonstrates:
- Server and client both written in Reason, using ocamlc+Melange https://github.com/aantron/dream/tree/master/example/r-fulls...
That example could also have been written in OCaml syntax, because ocamlc (native) and Melange (JS) both support OCaml. However, Reason is nicer if you want to use React with JSX.
- Server and client both written in OCaml, using ocamlc+Js_of_ocaml https://github.com/aantron/dream/tree/master/example/w-fulls...
The remaining example uses Ocaml on the server and ReScript on the client, using the ReScript compiler. However, you could use OCaml on the client with the ReScript compiler. Just as with Melange, you would lose access to nice JSX syntax https://github.com/aantron/dream/tree/master/example/r-fulls...
It's definitely a lot and not user-friendly to have to decide between all these options, but the community is experimenting greatly right now... so it's good and bad, and that's how it is :/
As for Node.js, using ReScript syntax requires you to use Node.js on the native side, but that is the only coupling. If you write your native side in OCaml or Reason, you can compile it to native code with ocamlc (technically, ocamlopt is the internal command; nobody uses either one directly, but the build system calls them).
Rx.NET
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Cool features like Random.Shared
One of the greatest things i discovered recently, is Reactive programming / Reactive Extensions ( https://github.com/dotnet/reactive ).
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Patterns for consuming a throttled/rate limited external APIs?
https://github.com/dotnet/reactive has a lot of different time related extensions for "events". Maybe you'll find something for yourself, if you google for rate limiting with reactive.
- [Game Dev] Programmation réactive fonctionnelle (FRP) pour les jeux?
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How can you detect when a user has stopped scrolling with WPF
Install Reactive Extensions: https://github.com/dotnet/reactive
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What is your preferred asynchronous programming library?
Another option is to use the RxJava library in Java. This library uses reactive programming principles to make it easy to write asynchronous and event-driven code. It's particularly well-suited for handling streams of data and allows you to write code that is both efficient and easy to read.
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MVVM Question: How do you manage the interaction between Model and ViewModel?
I'd use a dedicated event bus based on Reactive Extensions or MediatR to publish domain events from your domain services. This probably doesn't solve all your ViewModel update problems as is, maybe you need to revise the granularity (maybe you can have smaller ViewModels that refresh single property that exposes the Model) and lifespan (sometimes you can create a ViewModel, make it perform it's task and then discard it completely) of your ViewModels.
- Understanding the full benefits of yield and use of IAsyncEnumerable
- The 1st Alpha Release of System.Reactive.Async now on NuGet
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Async Methods after setting a property.
If you're finding yourself in a situation where you need to turn this behavior into a pattern because there are a lot of View Models that need to execute async business logic in response to some changes, I'd go with something like MediatR or Reactive Extensions. The idea is, again, that some other, probably business-level, component listens to changes in a decoupled way (that means it doesn't subscribe directly to your View Model, but to an event bus instead). View Model publishes change events to the event bus, and business-component reacts to these events by executing the business logic.
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System.Reactive v6.0.0-preview.1 available on NuGet
We'd really appreciate if it consumers of the library could update and provide any issues / bugs via the GitHub repo: https://github.com/dotnet/reactive/issues
What are some alternatives?
sihl - A modular functional web framework
Dynamic Data - Reactive collections based on Rx.Net
rescript-compiler - The compiler for ReScript.
RxJS - A reactive programming library for JavaScript
opium - Sinatra like web toolkit for OCaml
ObservableComputations - Cross-platform .NET library for computations whose arguments and results are objects that implement INotifyPropertyChanged and INotifyCollectionChanged (ObservableCollection) interfaces.
lwt - OCaml promises and concurrent I/O
duckdb - DuckDB is an in-process SQL OLAP Database Management System
ocaml-webmachine - A REST toolkit for OCaml
Disruptor-cpp - Port of LMAX Disruptor to C++
httpaf - A high performance, memory efficient, and scalable web server written in OCaml
MediatR - Simple, unambitious mediator implementation in .NET