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.

Want to see something featured in Haskell Weekly? Open an issue or pull request on GitHub.

Featured

• New things in Haskell package QA

  During the last month I have been working (not alone) on few Haskell package QA related tools: cabal-plan, multi-ghc-travis & trustee. In this posts I’ll show what’s new!

• New patterns in Tasty

  When I wrote Tasty in 2013, I borrowed the pattern language and its implementation from test-framework. I wasn’t fond of that pattern language, but it did the job most of the time, and the task of coming up with a better alternative was daunting.

• What is new in cross compiling Haskell

  In December I was finally able to provide new GHC cross compiler binary distribution for iOS, Android and Raspberry Pi from macOS Sierra and Linux.

• Using a development version of GHC with Nix

  In this post we look at combining modifications from different sources. The goal is to create a package set which can be used to compile packages with HEAD.

• A generative approach to simulating watercolor paints from scratch

  In my seven years of programming I have had the most fun in the past few months after discovering generative art. Hopefully you’ll see in this guide how fun it can be getting interesting images to look at as a reward for every little challenge you take on.

• Introduction to singletons: Part 2

  Welcome back to our journey through the singleton design pattern and the great singletons library! This post is a direct continuation of part 1, so be sure to check that out first if you haven’t already!

• People of programming languages: Interview with Simon Peyton-Jones

  We talk about seeing functional programming go from intellectual revolution to practical reality and the importance of investing in programming education.

• Papers I read and loved in 2017

  I spent 2017 as a research intern working at the systems group, ETH Zurich. I worked on Polly, a loop optimizer for LLVM, so this had me read a bunch of compiler related papers.

• The state comonad

  Is State a Comonad? Not Costate or rather, Store as we tend to call it today, but actually State s itself? Let’s see!

• radixtree: A prefix-tree parsing library for Haskell

  This is just a brief post about radixtree, which is a library that produces radix trees from text values and provides a generic parser suitable for use with Attoparsec, Trifecta, or Parsec.

Jobs

• IOHK seeking Haskell infrastructure wrangler in Scotland

  There are many Haskell infrastructure tools used by academics and in industry, including compilers, debuggers, profilers, packagers, and documentation tools. We are looking to fill a post devoted to improving Haskell infrastructure.

In brief

• A quick tour of generic-random
• Breaking changes, dependency trees
• Functional programming for mathematical computing
• GHCJS 8.2
• Idris 1.2.0 released
• Immutability: The less things change, the more you know
• Monads are just monoids in the category of endofunctors
• Optimizing tagless final
• Parsing and tweeting
• Request for comments on expanded Data.Sequence docs
• SQL database design with Yesod and Persistent
• Unsafely inspecting monadic computations
• Zip-folding

Package of the week

This week’s package of the week is Movie Monad, a free and simple to use video player.

Call for participation

• eta: Put all the mem(cpy, cmp, set) utility functions in MemoryManager
• pretty-simple: Add pTraceOpt function in Debug.Pretty.Simple
• rio: Rewrite export statements for nicer Haddocks
• stack: Show resolver being used when stack ghci is invoked outside of a project directory