Haskell Weekly

Welcome to another issue of Haskell Weekly! Haskell is a safe, purely functional programming language with a fast, concurrent runtime. This is a weekly summary of what’s going on in its community.

Featured

• Developer Nation Survey (ad)

  Calling All Devs! Help shape the future of development by taking the Developer Nation survey. We’ll donate to charity on your behalf and you could win a GoPro Hero 12 Black, gadgets, & more!

• Competitive Programming in Haskell: sieving with mutable arrays by Brent Yorgey

  This is one of those cases where for efficiency’s sake, we actually want to use an honest-to-goodness mutable array. Immutable arrays are not a good fit for sieving, and using something like a Map would introduce a lot of overhead that we would rather avoid. However, we only need the table to be mutable while we are computing it; after that, it should just be an immutable lookup table.

• hashable arch native by Oleg Grenrus

  It feels that the end of compilation pipeline - the assembly generation - isn’t getting as much attention as it could. Sure, these improvements would only decrease run times constant factors only. On the other hand, if we could get 2-3% improvements in hot loops without source code changes, why not get these?

• Haskell Certification Program by José Manuel Calderón Trilla

  Serokell and the Haskell Foundation are excited to announce a community-led Haskell Certification program. Serokell has developed an online testing platform for administering practical and theoretical Haskell problems. Haskell is a complex language, offering a wide range of techniques and features for programmers. It’s simply not feasible for a novice or intermediate programmer to master them all. The goal of the Haskell certification is to help standardize what it means to ‘know Haskell’ at various levels of experience.

• Mastering QuickCheck: Advanced yet Practical Techniques for Property-Based Testing by Koz Ross

  In this article, we aim to explore the powerful capabilities of QuickCheck and demonstrate how to leverage them effectively in real-world projects.

• ORM in Haskell | Beam Library Tutorial: Database Management Made Easy by Purely Haskell

  Discover the power of the Beam library for database management in Haskell! In this comprehensive tutorial, we dive deep into Beam, a type-safe and feature-rich library for working with databases in Haskell. Follow along as we explore its capabilities through practical examples, demonstrating how to set up and interact with databases efficiently.

• ZuriHac 2024 Videos Online by Farhad Mehta

  It was great to see you at ZuriHac 2024. In case you couldn’t attend, or would like to relive the magic, the recordings from the event are now online.

Jobs

Trying to hire a Haskell developer? You should advertise with us!

In brief

• GHC gets divide-by-constant optimisation, closing my 10 years old ticket about 10x slowdowns by Niklas Hambüchen

• haskell-flake 0.5.0 released - more stable than ever by Sridhar Ratnakumar

  This release includes fine-grained default settings for configuring multiple packages (e.g.: all local packages) easily. It includes several fixes, and is being used in most Haskell projects at Juspay as well as open source projects like hackage-server.

• Seqn: A sequence library by Soumik Sarkar

  Why a new library? Primarily because I’ve wished a few times that we had a data structure with similar properties to Data.Sequence, but spine-strict. seqn’s Seq fits that role. It is also value-strict, because I consider that a sane default.

Show & tell

• Algebraic Data Types with Haskell by LigerLearn

  A look into the theory behind product and sum types, culminating in the explanation of what algebraic data types are in Haskell and how you can define them. Part of the Intro to Functional Programming with Haskell Course

• Serverless Haskell with GHC WASM JSFFI + Cloudflare Workers by Hiromi Ishii

  I was excited to know that JavaScript FFI support landed in GHC WASM (so much kudos to @TerrorJack!), and since then I have tried to put GHC-generated WASM on Cloudflare’s Serverless service Cloudflare Workers.

Call for participation

• cabal: Don’t depend on hashable directly
• swarm: Remove redundant transformers dependency