What's new
Underscores and request parsing
We’ve released Web Servers lesson 9, Parsing requests, which continues our study of HTTP and gives a practical introduction to Attoparsec. We also continue to show how to ask GHCi for help with guides for using the beloved typed holes feature, all the uses of underscores, and warnings related to unused values.
Rigid types and block arguments
Type Classes now supports annual subscriptions and country-based discounts. We’ve added pages on rigid type variables and BlockArguments.
Stripe Haskell packages
This week we made some billing changes: There’s now an annual billing option in addition to monthly, and we now offer region-based discounts. We also took some time to publish a lot of the code that we use to work the Stripe API. You can find the code in the typeclasses/stripe repository on GitHub.
Covariance and GUIs
This week, more reference pages and new lessons in two of our ongoing courses! Topics include: Threads, levity polymorphism, pattern type signatures, bimap, POSIX signal handling, drawing with Cairo.
Clock and reference
We start our new series, Timepieces, with getting started with fltkhs. In Functortown lesson 4, breaking the laws!, Julie introduces using the Hedgehog library. We also have an overview of parsing libraries, an intro to concepts related to primitives, and more reference pages.
Almost Time
This week we released the third lesson in Functortown, Laws and orders, and the eighth lesson in Web Servers, The Never-ending response, and announce the beginning of a new course.
The Lessons Continue
This week we released the second lesson in Functortown, More common functors, and the seventh lesson in Web Servers, Chunking the message body.
A New Course Begins
This week we are beginning the Functortown course, a complete introduction to all kinds of functors. We also have added two new lessons in the Web Servers course since our last blog post, and we added a site index so the tags on posts are now clickable!
Intro to Template Haskell
Our first Template Haskell article focuses on one narrow use case: Compile-time evaluation of constant expressions. Because we care dearly about avoiding sources of runtime errors wherever possible.
Restructuring
We’ve restructured the site to make it easier to find content, added two JavaScript articles (one, two), and published some packages to Hackage. What’s next: Starting the Functortown course and continuing the Web Servers course.
GHCi helps those who help themselves
Julie presented a workshop on maximizing the useful information you can get from GHCi. It wasn’t recorded, but we’re working on getting all that information onto the site for our subscribers.
The various forms of Text and ByteString
Check out our new Haskell tip, entitled Strict, lazy, and builder – It covers the various string types in the text and bytestring packages.
C∘mp∘se :: Melbourne
Julie gave the keynote at C∘mp∘se :: Melbourne and we launched our new career as Haskell pamphleteers!
Web servers course
We’ve started releasing the web servers course, which will explain a lot about HTTP and how to write network applications in Haskell.
Finishing the first course
I chose the “Validation” course to be our flagship course on Type Classes because it’s material I’ve tested with meetup groups. Taking the same starting point as one of my more popular blog posts, it successively refactors relatively simple code until we’ve learned about several of Haskell’s most important features.
Video player improvements
We’ve added additional video formats, so videos should now be working on most devices. This post includes some details on how the HTML <video> tag supports multiple formats and how we generate DASH and HLS encoded versions of our videos.
Videos from Haskell Summer School
Haskell Summer School has wrapped up, and we are back to work. Recordings of our classes are available.
ZuriHac and Monadic Party
Julie just taught the beginner Haskell track at ZuriHac, and this week we are both teaching classes at Haskell Summer School in Poznań, Poland.
[Announcement] Prepare for launch
We are in the final stages of editing the initial course and project, and that content is starting to go live.
[Explainer] Function pipeline monoid
“A monoid is a pipeline of functions”? Be careful not to get lost in a particular example for a typeclass.
[Announcement] What to Expect from Type Classes
Since our initial Type Classes announcement, we’ve been asked a number of questions about payments and planned content. Find out what’s available now, when we’ll start taking payments, and what you can expect as a subscriber.
[Announcement] Type Classes are Born
On February 24, 1988, Philip Wadler introduced the idea of type “classes” for Haskell, as a solution to the problem of overloading. Thirty years later, we present Type Classes: a series of focused video courses on Haskell, Nix, and related subjects.