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Top 23 Scala Cat Projects
The easy way to learn Scala.
A minimal, idiomatic Scala interface for HTTP
http4s is a Typelevel project, and therefore falls into the "program in Scala as if it were Haskell" category. Many people find this off-putting, but honestly, I think with the resources listed above, this is the option at the best intersection of "mature" and "well-documented" available in Scala. The reason it's off-putting to many people is that Haskell-style pure FP isn't mainstream, so it isn't so much a matter of learning a new technology as it is a matter of learning a new paradigm, which necessarily means surfacing and unlearning things you already know, and perhaps confronting the uncomfortable feeling that things you thought were "fundamental," "have to be that way," aren't, and don't. I personally found this process liberating. But not everyone does.
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Asynchronous, Reactive Programming for Scala and Scala.js.Project mention: Ask HN: What are some of the most elegant codebases in your favorite language? | news.ycombinator.com | 2023-06-17
Optics library for Scala
A data access library for Scala + Postgres.
The Scala HTTP client you always wanted!
An implementation of the java pet store using FP techniques in scalaProject mention: Scala Resurrection | /r/scala | 2023-01-24
Hello, you can try to look for pet store implementations on GitHub using Scala, like https://github.com/pauljamescleary/scala-pet-store. The "Pet Store" is usually an example repo demonstrating how to build a CRUD service. Since Scala is a language capable of expressing multiple design techniques, multiple ways of solving similar problems exist, which is neither good nor bad, just irritating for a beginner.
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Principled code generation from OpenAPI specificationsProject mention: Ask HN: Why is there no specification for Command Line Interfaces? | news.ycombinator.com | 2023-02-27
What's the use case? I was thinking about this exact issue because my product ships several CLI tools, but I wasn't convinced it would be worth the effort.
An OpenAPI specification describes an HTTP interface, and I see it as useful because it makes it easier to write code in language-of-choice to generate HTTP requests (by generating client libraries from the OpenAPI spec).
For a CLI, the interface is the command-line. Usually people type these commands, or they end up in bash scripts, or sometimes they get called from programming language of choice by shelling out to the CLI. So I could see a use case for a CLI spec, which would make it easier to generate client libraries (which would shell out to the CLI)... but it seems a little niche.
Or maybe, as input to a documentation tool (like Swagger docs). I would imagine if you're using a CLI library like Python's Click, most of that data is already there. Click Parameters documentation: https://click.palletsprojects.com/en/8.1.x/parameters/
Or maybe, you could start from the spec and then generate code which enforces it. So any changes pass through the spec, which would make it easy to write code (server and client-side) / documentation / changelogs. Some projects like this: Guardrail (Scala) https://github.com/guardrail-dev/guardrail , and Connexion (Python) https://github.com/spec-first/connexion .
But without this ecosystem of tooling, documenting your CLI in a specification didn't really seem worth the effort. Of course, that's a bootstrapping problem.
:shopping_cart: The Shopping Cart application developed in the book "Practical FP in Scala: A hands-on approach"Project mention: Scala real world projects | /r/scala | 2023-07-03
A small companion to cats (by typelevel)Project mention: Mouse 0.4.2 - Early release | /r/scala | 2023-11-01
Not related to another scala lib called mouse? https://github.com/typelevel/mouse
Mockito for Scala language
functional tracing for cats
cats transformer type classes.
Syntactic sugar for monad composition in ScalaProject mention: "A New Library For Imperative ZIO Programming" by Alexander Ioffe at Functional Scala 2022 | /r/scala | 2023-01-10
Idiomatic, typesafe, and reactive Scala client for Apache Pulsar
Iteratees for Cats
:izakaya_lantern: Standalone examples shown in the book "Practical FP in Scala: A hands-on approach"
Integration between cats-effect and test frameworks
Next Level MTL for Scala
Scala library for boilerplate-free validation (by krzemin)
MongoDB client wrapper for Cats Effect & FS2
Employ Scala for serverless applicationsProject mention: [Scala] Iniziare con graalvm e http4s | /r/initaliano | 2023-04-21
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A note from our sponsor - InfluxDB
www.influxdata.com | 8 Dec 2023
What are some of the best open-source Cat projects in Scala? This list will help you: