cats-effect
fslang-suggestions
cats-effect | fslang-suggestions | |
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34 | 43 | |
1,961 | 338 | |
1.2% | 0.3% | |
9.7 | 2.8 | |
6 days ago | 9 months ago | |
Scala | ||
Apache License 2.0 | - |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
cats-effect
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A question about Http4s new major version
Those benchmarks are using a snapshot version of cats-effect. I don't know where that one comes from, but previously they were using a snapshot from https://github.com/typelevel/cats-effect/pull/3332 which had some issues (3.5-6581dc4, 70% performance degradation), which have since been resolved (see that PR for more info and comparative benchmarks).
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The Great Concurrency Smackdown: ZIO versus JDK by John A. De Goes
Recently, CE3 has had similar issues reported across multiple repositories, almost an epidemic of reports!
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40x Faster! We rewrote our project with Rust!
The one advantage Rust has over Scala is that it detects data races at compile time, and that's a big time saver if you use low level thread synchronization. However, if you write pure FP code with ZIO or Cats Effect that's basically a non-issue anyway.
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Sequential application of a constructor?
See also cats-effect and fs2. cats-effect gives you your IO Monad (and IOApp to run it with on supported platforms). fs2 is the ecosystem’s streaming library, which is much more pervasive in functional Scala than in Haskell. For example, http4s and Doobie are both based on fs2.
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Should I Move From PHP to Node/Express?
On the contrary, switching to the functional mindset, with something like Typelevel Scala3 and respective cats and cats-effect fs2 frameworks, helps to rethink a lot of designs and development approaches.
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Next Steps for Rust in the Kernel
I think "better Haskell on JVM" (in contrast to "worse Haskell") is a good identity for Scala to have. (Please note that this is an intentional hyperbole.)
Of course, there are areas where Haskell is stronger than Scala (hint: modularity, crucial for good Software Engineering, is not one of them). And Scala has its own way of doing things, so just imitating Haskell won't work well.
Examples of this "better Haskell" are https://typelevel.org/cats-effect/ and https://zio.dev/ .
All together, Scala may be a better choice for you if you want to do Pure Functional Programming. And is definitely less risky (runs on JVM, Java libraries interop, IntelliJ, easy debugging, etc...).
None of the other languages you mentioned are viable in this sense (if also you want a powerful type system, which rules out Clojure).
I agree that Rust's identity is pretty clear: a modern language for use cases where only C or C++ could have been used before.
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Java 19 Is Out
I would use Scala. I like FP and Scala comes with some awesome libraries for concurrent/async programming like Cats Effect or ZIO. Good choice for creating modern style micro-services to be run in the cloud (or even macro-services, Scala has a powerful module system, so it's made to handle large codebases).
https://typelevel.org/cats-effect/
https://zio.dev/
The language, the community and customs are great. You don't have to worry about nulls, things are immutable by default, domain modelling with ADTs and patter matching is pure joy.
The tooling available is from good to great and Scala is big enough that there are good libraries for typical if not vast majority of stuff and Java libs as a reliable fallback.
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Typelevel Native
What took my interest is this (for both JVM and future multithreaded Scala native): https://github.com/typelevel/cats-effect/discussions/3070 Having the same threads poll available IO events and execute callbacks should improve performance greatly
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Scala isn't fun anymore
The author is the creator of Monix and implemented the first version of cats-effect. He knows what he is doing.
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Question about some advanced types
You want Kernmantle, which quite honestly shouldn't be hard to implement around Cats and cats-effect. In particular, although Kernmantle doesn't require the use of the Arrow typeclass, there happen to be Arrow (actually ArrowChoice) instances for both Function1 from the standard library and Kleisli from Cats itself, given a Monad instance for the Kleilsi's F[_] type parameter. In other words, we should be able to port Kernmantle from Haskell to Scala (with the Typelevel ecosystem) and instantly be able to use pretty much anything else from the Typelevel ecosystem, or wrapped with it, in our workflow graphs. Pure functions, monadic functions, applicative functions, GADTs with hand-written interpreters, any of it. I think this would be eminently worth doing.
fslang-suggestions
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Reusing static constraints with multiple generics
Trying to extend this https://github.com/fsharp/fslang-suggestions/issues/1089 to have two generics:
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VN Compiler. How to use Blazor components with Bolero. Introducing Blazor.Diagrams. (Pt. 1) (Restart)
Basically, what I've made in Spiral. There is even a F# issue to improve the syntax.
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Can I call method on the output of the pipe?
Not currently supported but it's an open language suggestion that's likely to end up in F#. https://github.com/fsharp/fslang-suggestions/issues/506
- Mapperly - A .NET source generator for object to object mappings
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Microfeatures I'd like to see in more languages
Re: the argument accessor shorthand, there seems to be a proposal for exactly that (using _ instead of &): https://github.com/fsharp/fslang-suggestions/issues/506#issu...
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Need help with Azure.Storage.Blobs to do simple enumerate blob items
I found this post (https://github.com/fsharp/fslang-suggestions/issues/975) which is about the same thing, but I'm confused as to what the final resolution was. There was mention of a taskSeq, but I can't find much info on that.
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OCaml programmer with some noob F# ecosystem questions
An issue in FSharp suggestions
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Announcing .NET 7 Preview 7
F# doesn’t currently seem to support source generators.
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What are the features you're looking forward to in the next version of Fsharp?
"Blessed" literals: only FSharp.List and System.Array have a built-in collection syntax in the language ([ ] and [| |]). Only FSharp.List has a special pattern matching constructor (::). The language itself shouldn't favor a particular type over another: it should be possible, at the library level, to write the same code but using different collection types (related discussion here).
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F# (in)compatibility
I mostly write F# so I can only speak for F#, but if you want you can create a module which extends Seq to add the OCaml names. I suspect the same is possible in OCaml. The authors are not trying to impede compatibility, but compatibility is not a goal. If you value compatibility, or adhering to ML norms, and you use F#, I recommend you (kindly) advocate for it in relevant issues on the F# language discussion repo. https://github.com/fsharp/fslang-suggestions/issues
What are some alternatives?
ZIO - ZIO — A type-safe, composable library for async and concurrent programming in Scala
ProjectReunion - The Windows App SDK empowers all Windows desktop apps with modern Windows UI, APIs, and platform features, including back-compat support, shipped via NuGet.
FS2 - Compositional, streaming I/O library for Scala
HVM - A massively parallel, optimal functional runtime in Rust
fs2-grpc - gRPC implementation for FS2/cats-effect
nand2tetris - Original course HDL solutions, F# implementations for the software stack, and VHDL implementations for the hardware stack for the nand2tetris course and The Elements of Computing Systems book.
doobie-quill - Integration between Doobie and Quill libraries
fslang-design - RFCs and docs related to the F# language design process, see https://github.com/fsharp/fslang-suggestions to submit ideas
Kategory - Λrrow - Functional companion to Kotlin's Standard Library
FSharpPlus - Extensions for F#
Slick - Slick (Scala Language Integrated Connection Kit) is a modern database query and access library for Scala