The Haskell Cast

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**The Haskell Cast**

Listen to regular interviews with the Haskell community. The podcast covers news, libraries, and whatever other topics we wander onto with our guests.

Latest Episodes:

Episode 14 - Richard Eisenberg on Dependent Types in Haskell Jun 14, 2017

Show notes

00:29 What are dependent type systems?
03:38 applying dependent types to industry
07:30 writing dependently typed programs in Haskell today
09:07 GADTs (Generalized Algebraic Data Types)
11:01 the future of dependent types in GHC
13:40 teaching dependent types
18:03 learning dependent types
20:20 a future style of Haskell programming with dependent types
21:21 Servant and opaleye as an example of type-level features
23:22 tool support for dependently typed programming
24:06 simple applications of dependent types for linear algebra
26:25 Are dependent types worth it?
28:47 complex type system errors
33:07 LiquidHaskell
36:26 safe zero-cost coercions
41:20 total vs type safe
48:36 working on GHC’s type system
51:09 using GHC extensions in the GHC source code
53:00 road to Haskell
55:37 teaching Haskell to students
1:03:00 a hopeful future for reliable software through dependent types

Episode 13 - John Wiegley on Categories and Compilers May 11, 2017

Show notes

00:44 using Haskell, Nix, and Emacs for integrated offline development
08:48 building environments for particular dependencies with Nix
09:58 what Emacs and GHC have in common
12:58 developing with typed holes
14:43 compiling to categories
20:35 learning to love mathematics
22:41 applications for compiling to categories
25:25 Coq
28:15 specifying the ByteString library in Coq
34:30 Why Haskell?
40:00 writing a compiler in C vs Haskell
43:32 gitlib
45:52 getting your head around Haskell
48:23 recursion schemes/F-algebras
52:33 hnix

Episode 12 - Neil Mitchell on Development Tools Apr 17, 2017

Show notes

Neil Mitchell shares with us his enthusiasm for building development tools. We hear the story of how he built Hoogle in order to learn Haskell, why he created the Shake build system and what he hopes to accomplish with it, and how he uses hlint in his own development work. We discuss Haskell IDEs (including his own minimal ghcid) and briefly touch on a variety of other development tools and libraries that aim to improve Haskell development. Neil also shares a trick he uses for hunting and fixing space leaks in programs and libraries.

Episode 11 - Austin Seipp on Security Mar 06, 2017

Show notes

Austin Seipp joins us to discuss Haskell security and infrastructure. We talk about how Haskell security differs from C (and where it doesn’t) and some coming changes to Cabal security. Then we discuss Cryptol: a Haskell-inspired language for implementing cryptographic algorithms in a way that more closely resembles their mathematical specification. Finally, we talk a bit about his work in maintaining the haskell.org infrastructure and his time as a GHC release manager. Along the way, Austin shares about his pet projects, including hardware projects using CλaSH.

Episode 10 - Bryan O'Sullivan on Performance and Efficiency Oct 19, 2015

Show notes

Bryan O’Sullivan shares his experience helping make developers more efficient, both inside of Facebook as Director of Developer Efficiency and with his various Haskell libraries, some of which you probably know and use already: aeson, attoparsec, criterion, statistics, and text (to name a few). We speak about performance and optimization of Haskell programs and where documentation for “Real World” Haskell development should go from here. Talking with Bryan also reveals how far you can go with Haskell without being overly concerned about category theory and the other math behind the language and libraries.

Episode 9 - Conal Elliott on FRP and Denotational Design Dec 15, 2014

Show notes

Conal Elliott, inventor of Functional Reactive Programming, tells us about the birth of FRP as well as other stories from his 30+ years of functional programming experience. He shares what he considers the fundamentals of FRP (behaviors and events) and how they work in a model with continuous time. We speak about FRP practicality and efficiency, including how a continuous time model can help lead to a high performance implementation. Eventually we’re led into Denotational Design, which plays a part in the design and refinement of FRP and which Conal considers his simplest and clearest design tool.

Episode 8 - Ollie Charles on 24 Days of Hackage and Nix Jul 21, 2014

Show notes

Ollie Charles, author of 24 Days of Hackage (and a number of Haskell libraries), gives us his perspectives on Haskell libraries and how they relate to Perl’s CPAN. He shares how he began his transition from Perl to Haskell while working for MusicBrainz and how he came to work full-time on Haskell at Fynder. (Listen closely if you’ve wanted to write Haskell in your non-Haskell job.) We also chat briefly about developing in Haskell with Nix and a different take on equational reasoning.

Episode 7 - Chris Done on Compiling to JavaScript and SQL Jun 09, 2014

Show notes

Chris Done, creator of Fay, Try Haskell, and Structured Haskell Mode, chats with us about web development in Haskell. We start with compiling Haskell to JavaScript via Fay, Haste, and ghcjs. We then discuss SQL and the alternatives available. Finally, we speak briefly about shell scripting and Haskell. Other topics include Chris’s many side projects like Try Haskell and Hulk, his IRC server.

Episode 6 - Gabriel Gonzalez and Michael Snoyman on Pipes and Conduit Mar 03, 2014

Show notes

Gabriel Gonzalez and Michael Snoyman join us to discuss their solutions to the problems with lazy IO. Gabriel’s pipes library focuses on equational reasoning while Michael’s conduit library promises deterministic resource handling. Gabriel and Michael have already debated the merits and disadvantages of each other’s libraries on their blogs. Now we get them onto the podcast to explain the differences to us and talk about where they’re going in the future (and the possibility of converging on a single solution).

Episode 5 - Brent Yorgey on Diagrams and the Typeclassopedia Jan 22, 2014

Show notes

Brent Yorgey explains the motivation and purpose of his Diagrams library and how it relates to other programmatic graphics systems like TikZ. He then shares his motivation for writing the Typeclassopedia and his thoughts on how much category theory Haskell programmers need to know. He also shares some insights from teaching an introductory Haskell course.

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