Issue 313 2022-04-28
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.
Building a bulletin board using twain and friends by Gil Mizrahi
It’ll be so simple that we won’t even use a database, but hopefully it’ll provide enough information on twain that you can continue it yourselves if you’d like.
Calligraphy tutorial by Jonas Carpay
Today, I released calligraphy, a Haskell call graph/source code visualizer. In this post, I’ll walk you through how to actually use it.
Free monads in the real world by Arnau Abella
In this post, we have introduced free monads and how they can be used to implement embedded domain specific languages.
Generalizing Folds in Haskell by Danila Fedorin
Have you encountered Haskell’s
foldrfunction? Did you know that you can use it to express any function on a list?
The Hidden Dangers of Haskell’s Ratio Type by Neil Mayhew
It’s tempting to use
Ratiowith a fixed-width type like
Intis much faster than
Integer. However, let’s see what can happen if you do this.
Introduction to Haskell Typeclasses by Gints Dreimanis
To sum two members of the same type in Haskell via +, their type needs to have an instance of the Num typeclass. But what’s a typeclass, and what’s an instance of a typeclass? Read further to find the answers.
Let’s Program a Calculus Student by Iago Leal de Freitas
At first sight this may seem too monumental of a task for a mere exposition. But what if I told you that if we restrict ourselves to derivatives, it takes about a hundred lines of code?
So Long Surrogates: How we moved to UTF-8 in Haskell by Paul Brinkmeier
In this post we will illustrate the challenges we encountered implementing UTF-8 support in alfred-margaret and also give some insights into how we optimized our Haskell code for maximal performance.
Trying to hire a Haskell developer? You should advertise with us!
On Commenting Code by Michael Peyton Jones
Programmers like to go on about how you should or should not comment your code. This is my contribution.
Traverse: Fully Generalized Loops by Monday Morning Haskell
Today for our last article of for-loops month, we’ll look at the final generalization of this idea: the
Show & tell
Fcf-containers builds on defunctionalization techniques introduced at first-class-families and fcf-containers adds helpers to do type level (or compile time) computations.
Haskell Language Server version 188.8.131.52 by Zubin Duggal
VSCode-Haskell version 2.0.1 by Fendor
We are happy to announce a Release for the new major version release for the VSCode Haskell Extension!