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

• Announcing opt-env-conf by Tom Sydney Kerckhove

  This post announces opt-env-conf, a new settings parsing library for Haskell. This library combines the best of optparse-applicative, envparse, and autodocodec, together with the colours from safe-coloured-text to provide all your apps’ runtime settings.

• Building a data compression utility in Haskell using Huffman codes by Marcelo Lazaroni

  In this post we will implement a data compression program in about 150 lines of Haskell. It will use Huffman coding and handle arbitrary binary files using constant memory for encoding and decoding.

• Collatz Computations in Base 2 and 3 by Chris Smith

  Every so often, the Collatz conjecture comes up in discussion forums I read, and I start to think about it again. I did for a bit this past weekend. Here are my thoughts this time around.

• Haskell For Dilettantes - Part 1 - Intro by Tea Leaves

  My plan is to start a series of these videos where I introduce some aspect of the Haskell language and then explain it to you, probably very badly. Think of it as Baby’s First Haskell. And I wanted to call out the fact that although I am a programmer by trade, I don’t write Haskell professionally. You’re getting my dilettante’s opinions of the language. Hopefully you can find some value in that perspective.

• Multi Component Support in HLS with cabal-install 3.12 by Zubin Duggal

  Over the last few years we have been working on implementing support for multiple components (sometimes referred to as multiple home units) across various parts of the ecosystem. This is a feature which allows you to load multiple components, which may depend on each other, into a single GHC session. For instance, you can load both a library and a testsuite into a single GHCi session, and :reload commands will pick up changes across both components. In this post we will discuss how you can take advantage of this support in the Haskell Language Server.

• Servant on AWS Lambda, and Two New Libraries by Jack Kelly

  In a previous post, I mentioned that we run most of our Haskell code on AWS Lambda. Today, I want to look inside those binaries, discuss the libraries we use to do “serverless” web services on AWS, and highlight a few new libraries we’ve recently open sourced.

Jobs

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In brief

• First release candidate for stack-3.1.1 by Mike Pilgrem

• GHCup-0.1.30.0 released by Julian Ospald

• HLS 2.9.0.1 is now available by Zubin Duggal

Call for participation

• swarm: Highlight customised and mute creative keybindings in Help