refined VS enso

Scala has quite good support for refined types across multiple libraries. A solution using the refined library might look something like

Does the Refined library for Scala (at https://github.com/fthomas/refined; "eu.timepit" %% "refined") work in Scala 3? Does it work differently?

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

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.

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.

I think the way you model problems in Ada is superficially similar to refined types you find in some functional languages (e.g. Scala).

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.

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]).

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].

You will probably be interested into Iron or Refined.

> At least I have yet to see one that is actually useful in the sense of a generic (or even a single-purpose-built) language

Yeah as said, https://github.com/enso-org/enso seems to be a general purpose functional programming language with visual editor, but otherwise I haven't really seen any no-code solutions worth their salt. I'm not particularly a fan of enso either, but it's the best I've seen.

Although it's not quite the same, I do like what Enso[0] is bringing to the table, especially the 1:1 visual node/language interop. Whether this is generalisable to a fully decoupled interface remains to be seen, but there's definitely potential.

[0]: https://enso.org/

I think Enso is already taken by a YC company [0]. Could get confusing.

[0] https://enso.org

COMPANY: Enso Inc. TYPE: Full time LOCATION: Europe and United States of America – fully distributed company REMOTE: Only remote VISA: No VISA required DESCRIPTION: Hi, we are Enso (enso.org, Y Combinator S21)! We are looking for an amazing Cloud engineer to join our core team. We are a remote first company, working in Europe and the USA.

Friends of mine are developing Enso (https://enso.org/), an interactive programming language with dual visual and textual representations.

Even well before Bret Victor's time, there were tools for visual programming. I have been using LabView to maintain data processing in an optical laboratory.

> I'm convinced this entire space should be visual.

At my last 2 jobs I spent entirely too much time debugging Matillion jobs, which are visual. I have my doubts that it’s the panacea that it appears to be.

That said, you may find Enso particularly interesting: https://github.com/enso-org/enso