Haskell Weekly News: January 24, 2009

Submitted by byorgey on Sat, 01/24/2009 - 10:04am.
Haskell Weekly News: January 24, 2009

Welcome to issue 102 of HWN, a newsletter covering developments in the Haskell community.

Announcements

Monoids and fingertrees. Heinrich Apfelmus posted a nice tutorial explaining the monoid magic behind 2-3 fingertrees.

STM-IO-Hooks-0.0.1. Peter Robinson announced the stm-io-hooks library, which provides an STM monad with commit and retry IO hooks. A retry-action is run (once) in a separate thread if the transaction retries, while commit-actions are executed iff the transaction commits. The code is based on the AdvSTM monad by Chris Kuklewicz, but in addition also ensures some atomicity guarantees for commit-actions.

1000 libraries. Don Stewart announced that Hackage has now reached 1000 packages!

HTTP-4000.0.4 released. Sigbjorn Finne announced that a new release of HTTP, version 4000.0.4, is now available. The main change is the addition of registering a Browser event handler for capturing state changes to the request-response processing pipeline.

Blog noise

Haskell news from the blogosphere.

Quotes of the Week

  • Jonathan Cast: [on advertising for Haskell programmers and informing them that the codebase is actually in Perl at the interview] <Andrew Wagner> That's......evil. <Jonathan> I know. I'm evil too, though. So it's cool.
  • rwbarton: A type class is not a type just like a dog house is not a dog.
  • SPJ: [This is] clearly not a bug in GHC; but it would be more felicitous if it gave you a warning...
  • Gracenotes: > let o_o = 0.0 ;o' =(, ); ;o (*)=(*) ;( lol, xD :p )= o' o' $o.o$ (:[]) $o.o$ (:[]) o_o in (:[]) o_o :p
  • Cale: I plan on forming a symbiotic relationship with sandtrout, which, as they merge with my body, will sustain me as I slowly turn into a sandworm, and make use of my billions of other memories and prescience to rule over everyone and everything for millenia.
  • quicksilver: or in Java, we'd make it more generic by using a PolynomialDivisionOperatorFactory.
  • roconnor: I was going to read about laziness, but I decided to do it later, when I need to understand it.

About the Haskell Weekly News

New editions are posted to the Haskell mailing list as well as to the Haskell Sequence and Planet Haskell. RSS is also available, and headlines appear on haskell.org.

To help create new editions of this newsletter, please see the information on how to contribute. Send stories to byorgey at cis dot upenn dot edu. The darcs repository is available at darcs get http://code.haskell.org/~byorgey/code/hwn/ .