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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

Beating C with 80 lines of Haskell: wc by Chris Penner The challenge is to build a faster clone of the hand-optimized C implementation of the wc utility in our favourite high-level garbage-collected runtime-based language: Haskell!

A Summer of Runtime Performance by Andreas Klebinger GHC produces pretty fast code by most standards. After Well-Typed put some development effort towards faster code it’s now even faster, with a reduction in runtime of 3-4%.

Haskell in Production by Felix Mulder During the past year, my team has been building production services using Haskell. It’s been quite a journey. None of us had written production code using Haskell before.

GHCi :set command by Type Classes The :set command can be used to change various behaviors of GHCi from within a running REPL. Options set with the :set command can be undone with the :unset command.

Servant’s type-level domain specific language by Brad Parker Our aim here will be to understand how Servant can take so many varied API descriptions and guide us to a corresponding implementation.

Partial application using flip by Jasper Van der Jeugt I have been writing Haskell for a reasonable time now – I believe I am coming up on ten years – so sadly the frequency with which I discover delightful things about the language has decreased.

Monads as Graphs by Neil Mitchell In the Build Systems a la Carte paper we described build systems in terms of the type class their dependencies could take. This post takes the other view point - trying to describe type classes by the graphs they permit.

Ormolu: Announcing First Release by Mark Karpov and Utku Demir We’re happy to announce the first release of Ormolu, a formatter for Haskell source code. Some may remember our first post from a couple months ago where we disclosed our work on the Ormolu project — but carefully called it “vaporware” then. Times have changed; it’s not anymore.

Record Dot Syntax proposal by Neil Mitchell and Shayne Fletcher We propose a new language extension RecordDotSyntax that provides syntactic sugar to make the features introduced in the HasField proposal more accessible, improving the user experience.

Refactoring Yahtzee by Haskell Weekly Podcast Cameron Gera and Taylor Fausak discuss using types to guide refactoring toward better design.

Jobs

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In brief

Call for participation

Looking for something to work on? Browse Haskell Hacktoberfest issues on GitHub.