refined
Refinement types for Scala (by fthomas)
scala-newtype
NewTypes for Scala with no runtime overhead (by estatico)
Our great sponsors
| refined | scala-newtype | |
|---|---|---|
| 16 | 4 | |
| 1,680 | 539 | |
| - | 0.0% | |
| 8.6 | 0.0 | |
| 7 days ago | about 2 years ago | |
| Scala | Scala | |
| MIT License | Apache License 2.0 |
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.
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.
scala-newtype
Posts with mentions or reviews of scala-newtype.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2021-09-23.
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Delphi 11 Alexandria Has Been Released
These are easily achived by this lib: https://github.com/estatico/scala-newtype Coq also can have even more advanced types.
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Help with Single Value Validated Types
You want either a refined type, a newtype, or if you are in Scala 3 an opaque type.
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Refine types
Newtype has a great Readme as well: https://github.com/estatico/scala-newtype
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Readable Scala Style
If it's an option at all, I'd recommend using newtype for this.
What are some alternatives?
When comparing refined and scala-newtype you can also consider the following projects:
Shapeless - Generic programming for Scala
Records for Scala - Labeled records for Scala based on structural refinement types and macros.
ZIO - ZIO — A type-safe, composable library for async and concurrent programming in Scala
Cassovary - Cassovary is a simple big graph processing library for the JVM
Apache Spark - Apache Spark - A unified analytics engine for large-scale data processing
scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.
scala - Scala 2 compiler and standard library. Bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3
Scalaz - Principled Functional Programming in Scala
scala-jsonschema - Scala JSON Schema
Ammonite-Ops - Scala Scripting
Hamsters - A mini Scala utility library