Simulacrum VS Shapeless

Compare Simulacrum vs Shapeless and see what are their differences.

Simulacrum

First class syntax support for type classes in Scala (by typelevel)
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Simulacrum Shapeless
1 8
922 3,207
-0.2% -
4.6 8.1
24 days ago about 16 hours ago
Scala Scala
GNU General Public License v3.0 or later 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.

Simulacrum

Posts with mentions or reviews of Simulacrum. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-08-10.
  • Friction-less scala - Tell us what is causing friction in your day-to-day life with Scala
    14 projects | reddit.com/r/scala | 10 Aug 2021
    The Cats ecosystem offers mature named abstractions providing algebraic laws virtually identical to those offered by Haskell and PureScript and that have stood the test of time, at the cost of relying on a "design pattern" approach to implementation you have to squint a bit to see ("typeclasses" based on higher-kinded types and implicit arguments) and that sometimes doesn't play nicely with Scala's colored local type inference. The selling point of this, coupled with parametricity ("tagless-final style"), is the ability to reason algebraically about your code.

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 2021-11-22.
  • Fp libraries that target scala 3 exclusively?
    5 projects | reddit.com/r/scala | 22 Nov 2021
    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.
  • Delphi 11 Alexandria Has Been Released
    4 projects | reddit.com/r/programming | 23 Sep 2021
    please show me something like this: https://akka.io/ or this: https://zio.dev/ or this: https://github.com/milessabin/shapeless
  • 6 Years of Professional Clojure
    6 projects | news.ycombinator.com | 2 Aug 2021
    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.
  • Scala3: Does it provide a simplified way of doing n-term generic parameters?
    2 projects | reddit.com/r/scala | 6 Jun 2021
    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
  • Scala: A Love Story
    4 projects | dev.to | 21 Apr 2021
    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.
  • Jam 0.0.4 got Scala 3 support
    3 projects | reddit.com/r/scala | 17 Apr 2021
    I also investigated shapeless3 macroses: https://github.com/milessabin/shapeless/tree/shapeless-3/modules, but they are more about derivation than reflection. And probably that is all I found.
  • [Scala3] Get the type of container with wildcard type (i.e. List[?])
    1 project | reddit.com/r/scala | 1 Mar 2021
    Well, that is sometimes possible, depending on a structure of Foo. If you have a List, for instance, you can iterate every element, and if every element is A, then it's safe to cast a list to List[A]. In fact, shapeless provides exactly that, in form of Typeable[List[A]], in a more generic form. I suppose shapeless also can derive a typeable instance for you, but I haven't dug into scala 3 version of it.
  • Why Learn Haskell?
    2 projects | news.ycombinator.com | 1 Mar 2021
    I'm not sure where is the line between extensive and basic knowledge. Here is my more detailed exposure:

    In commercial context:

    * Of strongly typed ones only Scala (with [shapeless]). Can reluctantly throw in Kotlin as well for it's amazing structured concurrency.

    In non-commercial context:

    * Went through a few chapters of [Software Foundations] doing Coq proofs.

    * Worked through most of the [Types and Programming Languages] (writing typecheckers in Ocaml)

    * 3 services in Haskell (1 on Scotty, 2 on Servant). Loved persistent+esqueleto for the ORM layer, disliked Opaleye.

    * 2 projects in PureScript (1 with Halogen, 1 with React bindings).

    * 1 project in ReasonML (Ocaml).

    -

    > I am afraid there is no way back for me

    I see where you are coming from. In my case I can alternate between "I want all invariants properly expressed and checked" and "I just want to ship that barely-working piece of junk and iterate on it". I learned to adjust depending on organization needs. IMO, for many orgs, especially startups/scaleups, the latter is often the more fitting way. With that in mind, I'm willing to trade the guiding hand of great type systems for other productivity aspects (amazing runtime and cohesive web framework in Elixir's case).

    [shapeless]: https://github.com/milessabin/shapeless

    [Software Foundations]: https://softwarefoundations.cis.upenn.edu/

    [Types and Programming Languages]: https://www.cis.upenn.edu/~bcpierce/tapl/

What are some alternatives?

When comparing Simulacrum and Shapeless you can also consider the following projects:

cats - Lightweight, modular, and extensible library for functional programming.

Monocle - Optics library for Scala

Scalaz - Principled Functional Programming in Scala

Chimney - Scala library for boilerplate-free, type-safe data transformations

scala.meta - Library to read, analyze, transform and generate Scala programs

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.

ScalaTest - A testing tool for Scala and Java developers

scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.

Enumeratum - A type-safe, reflection-free, powerful enumeration implementation for Scala with exhaustive pattern match warnings and helpful integrations.

refined - Refinement types for Scala

Scala Async - An asynchronous programming facility for Scala

Freestyle - A cohesive & pragmatic framework of FP centric Scala libraries