Welcome to issue 102 of HWN, a newsletter covering developments in the Haskell community.
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.
Luke Palmer: Existential Memoization.
Luke Palmer: The Third Virtue. Luke has a Grand Vision (TM)!
Darcs: darcs weekly news #14.
Magnus Therning: More sensible comments on cabal-debian.
GHC / OpenSPARC Project: Wait and perform.
Andy Gill: Memoization in GHC. A cool tutorial on how to memoize a pure function with GHC, without changing the function's definition.
Magnus Therning: Experience with cabal-debian.
Joachim Breitner: darcswatch uploaded to hackage.
GHC / OpenSPARC Project: The Strap.
Real-World Haskell: Bryan O’Sullivan on the Power of Haskell.
Jeff Heard: Visualizing groundwater nitrate concentration.
Don Stewart (dons): Open source releases and growth.
Lennart Augustsson: Performance update on LLVM.
Arch Haskell News: Piet implementation for Arch.
Mark Jason Dominus: Triples and Closure. Did you know that monads are like closure operators? If not, read on.
GHC / OpenSPARC Project: The Grind.
LHC Team: Functions in Haskell..
Magnus Therning: Building Debian packages of (cabalised) Haskell packages.
Xmonad: xmonad cheatsheet.
Xmonad: xmonad on twitter.
Jeff Heard: A random note on programming with Gtk2Hs..
Jonathan Tang: Some observations on Kinds.
Martijn van Steenbergen: Type Synonym Families.
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