FS2 Alternatives
Similar projects and alternatives to FS2
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ScalaMeter
Microbenchmarking and performance regression testing framework for the JVM platform.
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scala-pet-store
An implementation of the java pet store using FP techniques in scala
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Scout APM
Scout APM: A developer's best friend. Try free for 14-days. Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
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pfps-shopping-cart
:shopping_cart: The Shopping Cart application developed in the book "Practical FP in Scala: A hands-on approach"
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BootZooka
Simple project to quickly start developing a Scala-based microservice or web application, without the need to write login, user registration etc.
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intro-cats-effect
Slides and video recording for my "Intro to Cats-Effect" talk (by Daenyth)
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Reviews and mentions
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Introducing effects systems S.A. ZIO at work?
Assuming the bug mentioned here is https://github.com/typelevel/fs2/issues/2568, we came up with a partial fix in a day (https://github.com/typelevel/fs2/pull/2569) and a complete fix in 2 days: https://github.com/typelevel/fs2/pull/2572. Note the original bug was opened on a Saturday. :)
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ScalablyTyped publishes Scala 3 support
As of very recently, we're using ScalablyTyped in our fs2-io cross build for node. https://github.com/typelevel/fs2/pull/2453
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Improving akka http code
In that case, it's best to keep different streaming libraries separate, in their own little "worlds". fs2 + cats has Queues for this purpose https://fs2.io/#/concurrency-primitives. Future has the Promise abstraction.
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Learning FS2
So far I'm aware of a great documentation that is out there (fs2.io) and some resources (https://fs2.io/#/documentation).
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Scala 3 is here!
ScalaZ was changed to cats-effect. For streaming, look at fs2. Cats-effect 3 cleans up a lot of the library, but as with any code it can be clean or messy depending on the dev
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[FS2] - Mutability of Queue in Stream
Lets decompose this code from the article a little. The definition of circularBuffer indicates that given a buffer size the function will return G[Queue[F, A]]. https://github.com/typelevel/fs2/blob/19bb74cac3c9b51bc5419b70fed224d24e0e1c2e/core/shared/src/main/scala/fs2/concurrent/Queue.scala#L173-L174 G is some higher kinded type with an implementation of the Sync typeclass (https://github.com/typelevel/fs2/blob/19bb74cac3c9b51bc5419b70fed224d24e0e1c2e/core/shared/src/main/scala/fs2/concurrent/Queue.scala#L152) (a typeclass for suspending synchronous actions). Why is G needed? Well Queue's are asynchronous data structures so some concurrency primitives must be allocated like Ref and Deferred. (https://typelevel.org/cats-effect/docs/std/ref).
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Example of building web apis (functionally) in Scala
Watch the talk "Streams - Your New Favorite Primitive" by Ryan Peters (aka sloshy) and then looking into the docs of fs2. - This one to learn one of the most used / useful libraries of the typelevel ecosystem to process data.
Stats
typelevel/fs2 is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
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