Shapeless
Generic programming for Scala (by milessabin)
refined
Refinement types for Scala (by fthomas)
Shapeless | refined | |
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13 | 16 | |
3,391 | 1,715 | |
- | - | |
7.2 | 8.5 | |
13 days ago | 7 days ago | |
Scala | Scala | |
Apache License 2.0 | MIT License |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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.
Shapeless
Posts with mentions or reviews of Shapeless.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-07-06.
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Question regarding Recursive datatypes and cats typeclasses (Haskell to Scala)
Scala 2-only: * Shapeless (there is Shapeless for Scala 3 but less often needed as basic things are in Scala 3)
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Is there the equivalent of this in Scala ? (Maps to Struct)
This is the FromMap typeclass in Shapeless. Note that there’s a companion syntax package for it providing .toRecord for any Map and an appropriately-structured Record (and a Record is the LabelledGeneric representation of a case class).
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Scala 3: modifying product types in compile-time
If that's what you want, you can use Shapeless' records and HList. You can probably replicate this in plain Scala 3 with tuples and literal types as you said. It won't play nice with your others libs though but maybe there are integrations.
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Does Scala have support for Dependent types?
See the Shapeless Sized example.
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How does Scala's type system compare to TypeScript's? Is it as powerful?
Shapeless has Sized: https://github.com/milessabin/shapeless/blob/v2.3.9/core/src/main/scala/shapeless/sized.scala
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Fp libraries that target scala 3 exclusively?
I know that libraries like Scodec and shapeless were rewritten practically from scratch for Scala 3, taking advantage of the next syntax and internals, as well as protoquill - a Scala 3 implementation of Quill.
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Delphi 11 Alexandria Has Been Released
please show me something like this: https://akka.io/ or this: https://zio.dev/ or this: https://github.com/milessabin/shapeless
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6 Years of Professional Clojure
That largely depends on the type system. Languages like Haskell and Scala which have much more powerful type systems than C/Java/Go/etc absolutely do allow you to do those sorts of things. It is a bit harder to wrap your head around to be sure and there are some rough edges, but once you get the hang of it you can get the benefits of static typing with the flexibility of dynamic typing. See https://github.com/milessabin/shapeless or a project that I've been working on a lot lately https://github.com/zio/zio-schema.
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Scala3: Does it provide a simplified way of doing n-term generic parameters?
Just use cats and use the apply syntax .mapN for this. Seriously. There isn't a way to do it without generating source code that I can see in the api. Scala 3's HList Tuples aren't like Shapeless 2's HLists and I can't figure out a way in the api to reduce the tuple members down from (A, B, C, D) into an E, generically, yet with Scala 3 poly functions, unlike what you could do in Shapeless 2 with HList
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Scala: A Love Story
Scala has sparked a huge ecosystem of very high quality libraries (Cats, Scalaz, shapeless, to name but a few). I think a major reason for this is that Scala attracts developers who value the advantages of the JVM, but are fed up with the limitations of the Java programming language and understand the benefits of an expressive type system and functional programming.
refined
Posts with mentions or reviews of refined.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-02-02.
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Make Invalid States Unrepresentable
Scala has quite good support for refined types across multiple libraries. A solution using the refined library might look something like
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Does the fthomas/refined library work differently in Scala 3?
Does the Refined library for Scala (at https://github.com/fthomas/refined; "eu.timepit" %% "refined") work in Scala 3? Does it work differently?
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Type erased on implicit evidence check
I'm trying to create a poor man version of refined types implementation with a simple validation of string content and check the return type via Implicit evidence on another function. It seems that the type got erased after it got returned from the check
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Design by contract - Preconditions and Postconditions - I'm really amazed with Scala.
Scala likes to do design-by-contract on the type level. You encode your pre- and post- conditions into types. Libraries like iron (scala 3) https://github.com/Iltotore/iron and refined (scala 2) https://github.com/fthomas/refined allow you to do all that without throwing any exceptions and they can even enforce some simple predicates at compile time.
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Restrict uses of annotation in Scala
Annotation is not the only way (and probably not the best IMHO) to do refined types. You might be interested in Iron in Scala 3 or Refined in Scala 2/3.
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Cross-Training to Ada - which are the best languages to begin from?
I think the way you model problems in Ada is superficially similar to refined types you find in some functional languages (e.g. Scala).
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Can types replace validation?
In one respect, nothing. You’re right. Even given refinement types as in Haskell or Scala, there is indeed a necessarily-partial function (refineV in Scala) to refine a value to its refinement type.
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Help me break the fourth wall
Perhaps refined would help you? It lets you set constraints (i.e. "rules") for values / types. You get compile-time enforcement for constants and fallible methods for runtime values (i.e. Either[Error, RefinedValue]).
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Simple, Naïve, and Wrong: More than you wanted to know about Scala Case Classes
This is more or less how derivation works when you want to use something like Refined types (it exposes Validate[Type, Refinement] typeclass if I remember correctly). Enumeratum exposes Enum[A], and newtypes expose Coercible[From, To].
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Opinions on implementing traits for validation with the help of a companion object
You will probably be interested into Iron or Refined.
What are some alternatives?
When comparing Shapeless and refined you can also consider the following projects:
cats - Lightweight, modular, and extensible library for functional programming.
scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.
Monocle - Optics library for Scala
Records for Scala - Labeled records for Scala based on structural refinement types and macros.
magnolia - Easy, fast, transparent generic derivation of typeclass instances
Cassovary - Cassovary is a simple big graph processing library for the JVM
Scalaz - Principled Functional Programming in Scala
Chimney - Scala library for boilerplate-free, type-safe data transformations
Ammonite-Ops - Scala Scripting
scala-newtype - NewTypes for Scala with no runtime overhead