Welcome to issue 114 of HWN, a newsletter covering developments in the Haskell community.

The 5th Haskell Hackathon is underway in Utrecht! Happy Haskell hacking! An early HWN this week since I will be traveling this weekend (but not, unfortunately, to the Hackathon).

Announcements

Reminder: Haskell Communities and Activities Report. Janis Voigtlaender reminded everyone that the deadline for the May 2009 edition of the Haskell Communities and Activities Report is only two weeks away. If you haven't already, please write an entry for your new project, or update your old entry.

primes. Sebastian Fischer announced the release of the primes package, which implements lazy wheel sieves for efficient, purely functional generation of prime numbers in Haskell.

level-monad-0.3. Sebastian Fischer announced version 0.3 of the package level-monad, which implements breadth-first search directly as an instance of MonadPlus (without using an intermediate tree representation). Version 0.3 adds a MonadPlus instance for iterative deepening inspired by Michael Spivey's paper on Algebras for combinatorial search.

hgettext 0.1.10. Vasyl Pasternak announced a new release of the hgettext package, which now has bindings to all gettext functions.

Haskell logo in TeX. Philip Hölzenspies announced a version of the new Haskell logo design prepared using TikZ, for inclusion in LaTeX documents.

The Monad.Reader (14) - Call for copy. Wouter Swierstra issued a call for copy for Issue 14 of The Monad.Reader. The deadline for submissions is May 15, 2009. Let Wouter know if you intend to submit something -- the sooner, the better.

time 1.1.2.4. Ashley Yakeley announced the release of time 1.1.2.4, which should now compile on Windows.

Discussion

Code Golf. Sebastian Fischer started a lively round of code golf with his code for list diagonalization.

Converting IO [XmlTree] to [XmlTree]. rodrigo.bonifacio asked how to convert an IO [XmlTree] into an [XmlTree], leading to a discussion of Haskell pedagogy.

Blog noise

• Roman Cheplyaka: Fun in Utrecht.

• Roman Cheplyaka: Utrecht: first impressions.

• >>> Daniel van den Eijkel: Hommage: Haskell Offline Music Manipulation And Generation EDSL.

• >>> Brandon Simmons: Some initial tests of Tries.

• Christopher Lane Hinson: Trends in Profiling Haskell.

• >>> Larry O'Brien: Windows & .NET Watch: Haskell: It's like Klingon, but with math!.

• Sean Escriva: Why Haskell is a joy to learn.

• GHC / OpenSPARC Project: Instruction counts on x86 vs SPARC.

• Sebastian Fischer: Barefaced pilferage of monadic bind.

• Benjamin L. Russell: Climbing the Towers of Hanoi with Haskell-style Curry from a Monadic Container (While Sparing the Sugar!).

Quotes of the Week

• Gracenotes: And then the type system goes all crazy and demands that x and 1 are both Word32s!
• mauke: data What a = No; instance Monad What where { return _ = No; No >>= _ = No }
• pumpkin: makes the next internet hit video, 2 natural transformations, 1 functor
• mmorrow: a functor is like an analogy between two analogies
• FliPPeh: @faq Can Conficker be rewritten in Haskell? <lambdabot> <no location info>: parse error on input `:'
• HairyDude: The Haskell Type System is a Harsh Mistress.. there ain't no such thing as a free theorem.
• LeCamarade: Now, let's say the set is {Haskell, SML, Ruby, Tomatoes, Human, Cabbage, Noise, IRC}.
• pjdelport: YO DAWG I HERD YOU LIKE CARS SO WE PUT A PAIR IN YO CAR SO YOU CAN CAR WHILE YOU CAR
• Babelfish: And there you travel: a beam tracer! Naturally, there are many things that ought to be amend.

About the Haskell Weekly News

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