refined
Stateless Future
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| refined | Stateless Future | |
|---|---|---|
| 16 | - | |
| 1,680 | 177 | |
| - | 0.0% | |
| 8.6 | 0.0 | |
| 7 days ago | about 7 years ago | |
| Scala | Scala | |
| MIT License | Apache License 2.0 |
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refined
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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.
Stateless Future
We haven't tracked posts mentioning Stateless Future yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
Shapeless - Generic programming for Scala
Scala Graph - Graph for Scala is intended to provide basic graph functionality seamlessly fitting into the Scala Collection Library. Like the well known members of scala.collection, Graph for Scala is an in-memory graph library aiming at editing and traversing graphs, finding cycles etc. in a user-friendly way.
Records for Scala - Labeled records for Scala based on structural refinement types and macros.
Twitter Util - Wonderful reusable code from Twitter
Cassovary - Cassovary is a simple big graph processing library for the JVM
Enumeratum - A type-safe, reflection-free, powerful enumeration implementation for Scala with exhaustive pattern match warnings and helpful integrations.
scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.
Scala Blitz - Scala framework for efficient sequential and data-parallel collections -
Scalaz - Principled Functional Programming in Scala
n-scala - A new Scala wrapper for Joda Time based on scala-time
Ammonite-Ops - Scala Scripting
ScalaTest - A testing tool for Scala and Java developers