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June 2nd, 2022, ISSUE 432

READING

Free Monad in Scala

In this article, we did a comprehensive overview of what a Free monad is, why it’s useful, how it helps us decouple our code, how it adds flexibility and testability in our programs, and we implemented our own simple version of a Free monad along with an example abstract program and an interpreter for it in the style of Cats Effect.
Daniel Ciocîrlan (@rockthejvm)
Tracking Side Effects in Scala

What if we’d use Scala’s type system for tracking side-effects in impure code, too?
Alexandru Nedelcu (@alexelcu)
Concurrent Sudoku Solver: Part 3 - Using Cats Effect Queue

In this post, we will use a different concurrency primitive from the Cats Effect standard library, Queue, to write a much simpler Sudoku Solver implementation.
Farooq Qaiser
Data validation using cats Validated

In this blog, we looked at data validation and error accumulation using Cats Validated.
Yadu Krishnan (@yadukrishnank)

VIDEOS

Resource safety is hard - SPFS #10

We're getting the tests to compile after starting to move into streams in episode 9. There's also a huge resource safety issue from episode 9 that I finally understood and fixed here, as well as some work to recover the ability to have typed errors in streams.
Jakub Kozłowski (@kubukoz)
The Two Minute Twenty Second Ten-Step Tail Rec Transformation Technique

This should scale straightforwardly to while-loops of any complexity.
Kit Langton (@kitlangton)

EVENTS

Lambda Days, July 28th-29th, Kraków, Poland

A vibrant event focused on FP and its growing community. Find out what is possible with functional programming - explore the latest in battle-tested Scala, Erlang and Haskell, experience the energy F# and Elixir bring to the table, connect with the innovators working with Elm, Luna and Ocaml, see what comes up next!
LambdaDays (@LambdaDays)
ScalaCon 2022 CFP, October 4th-5th, virtual event

ScalaCon is looking for talks covering different areas of Scala. Talk slots are around 40-45 minutes in length with 5 minutes of Q&A time. CFP closes at May 12, 2022 16:50 UTC!
ScalaCon (@scalacon)
Functional Scala 2022, December 1st-2nd, London

Use our link and get a 10% discount for Scala Times readers!
Ziverge (@zivergetech)
Functional Scala 2022 CFP

Apply before October 15th.
Ziverge (@zivergetech)
ScalaWAW #21 - we're back!, Thu, Jun 9, 2022, 6:00 PM | Meetup

VARIA

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