Issue 103 2018-04-19
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.
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In this post, we will outline a major difficulty in translating object-oriented Ruby to Haskell, and present a method for aiding the translation by visualizing the call graph of the Ruby code.
This blog post will address two issues: how to decide whether a particular operation can sensibly be described as “integer division”, and why there are a few different options, and what the differences between them are.
The fundamental technique used to do so is not novel, and it seems to be periodically rediscovered every so often, but it has never been published or documented anywhere, and getting it right involves understanding a great number of subtleties about the Racket macro system.
We launched our monthly webinar series on Wednesday, April 11th with our first webinar on how to handle asynchronous exceptions in Haskell.
By picking a nightly plan and building it using development versions of GHC at different commits, we can detect changes in the build status of packages contained in the plan, which are caused by changes in GHC, thereby detecting potential regressions in the compiler.
The problem I see with MonadError is that it does not address the fundamental difference between these two types of instances. I can pattern match an Maybe a with a default value to get back an a. With IO that is just not possible.
The algorithm to desugar constraints into dictionaries hasn’t been discussed much. Since it’s rather involved, and quite interesting, I thought it might make a good topic for a blog post.
Combinatorial optimization refers to assigning discrete values to a set of variables with the aim to minimize (or equivalently, maximize) a given objective function.
Given the fact that we can derive an unfold from a fold (and vice versa), and given the powerful tool in our toolbox that is function composition, an important question we can ask is: “What happens when we compose an unfold with a fold?”
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- A simple hylomorphism example
- Endomorphic composite as a monoid
- For all the world to see: Deploying Haskell with Heroku
- GHC proposal: Compile-time literal values
- GHC proposal: Deriving via
- Ghcid with colors
- LTS Guarantees and exceptions
- Rotations, twists, and plaits
- Stack version 1.7 release candidate
- Working with lists
Package of the week
This week’s package of the week is asset-bundle, a build-time Cabal library that bundles executables with assets.
Call for participation
- disco: Add Boolean as a synonym for Bool
- duckling: Issue with Datetime
- servant: Make
Servant.Client.Ghcjs.runClientMtake in a
- shake: tutorials: encourage the name “Shakefile.hs”
- April 19: Experience Report: Large Data Processing in a Managed Language in Boston, Massachusetts, United States
- April 20: Utah Elm Lunch in Lehi, Utah, United States
- April 21: Seattle Area Haskell Users’ Group: General discussion in Seattle, Washington, United States
- April 23: Haskell Peer Study Group in Vancouver, British Columbia, Canada
- April 24: Learn Haskell in Amsterdam, Netherlands
- April 25: Getting started with testing in Haskell in Gainesville, Florida, United States
- April 26: Seriously, the Haskell Type Checker is Your Friend
- April 27-29: BayHac 2018 in San Francisco, California, United States