refined
Ammonite-Ops
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refined | Ammonite-Ops | |
---|---|---|
16 | 15 | |
1,680 | 2,585 | |
- | 0.4% | |
8.5 | 8.5 | |
3 days ago | 1 day ago | |
Scala | Scala | |
MIT License | MIT License |
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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
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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.
Ammonite-Ops
- RFC: A Path Forward for Ammonite REPL and Scripts in 2023 and Beyond
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Does ammonite support indent based syntax?
The indent based syntax is only available in Scala 3, you have to download a matching ammonite version from https://github.com/com-lihaoyi/Ammonite/releases
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Scala Isn't Fun Anymore
That's funny, because this is what I really like about Scala; how quick and easy it is to get a project started.
> sbt new scala/scala3.g8
will just create an empty project. If you don't even want to bother with a project, use use scala-cli or ammonite (http://ammonite.io/) to just start banging out code.
Even the upgrading of a project from Scala2 to Scala3 is a breeze, thanks to very good backwards compatibility of new library releases.
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No build target could be found
Ammonite is a very good REPL for Scala. You can invoke it with amm and type expressions into it, or load a Scala “script file” whose name ends with .sc into it, or many other things. It’s documented at https://ammonite.io. 2. sbt is the dominant build tool for Scala projects. As others have commented, when you open a folder in Visual Studio Code and try to make Metals “aware of it,” it expects to find a “Scala project” in the folder. A “Scala project” isn’t just Scala source code. See https://www.scala-sbt.org for details. 3. Also be aware that Metals supports worksheets, so you can easily experiment with code in your project interactively, too.
- A Python-compatible statically typed language erg-lang/erg
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Scala 3 Reflection
Scripting API is quite limited, so the third option. - reuse the ammonite scripts https://github.com/com-lihaoyi/Ammonite or look how this is implemented (using internal compiler API),
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New to Scala
Your exposure to Functional Programming with Haskell and Clojure suggest you will certainly pick up Scala quickly. With ZIO and cats, you can write robust software quickly. Consider the excellent Coursera Scala course. Get "the Red Book" https://www.manning.com/books/functional-programming-in-scala, and most important, play. Experiment to see how things work. Get https://ammonite.io/
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Audacity Fork Without Any Sentry Telemetry or Crash Reporting
Here's an example of a smaller project that added telemetry without suffering a fork:
https://github.com/com-lihaoyi/Ammonite/issues/607
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Scripting with Java – Improving Approachability
Or ammonite - I've ran Gatling performance test from a simple script based on this gist it fetches all the dependencies, compiles and runs the test, producing nice html report..
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25 years of OCaml
Scala with the Typelevel ecosystem. Stay on the jVM, but have a much more pleasant and robust experience, including a great REPL.
What are some alternatives?
Shapeless - Generic programming for Scala
better-files - Simple, safe and intuitive Scala I/O
Records for Scala - Labeled records for Scala based on structural refinement types and macros.
Cassovary - Cassovary is a simple big graph processing library for the JVM
Scalaz - Principled Functional Programming in Scala
scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.
calculator - Windows Calculator: A simple yet powerful calculator that ships with Windows
cats - Lightweight, modular, and extensible library for functional programming.
scala-newtype - NewTypes for Scala with no runtime overhead
scala.meta - Library to read, analyze, transform and generate Scala programs