Monthly Archives: April 2011

Monoids for Maybe

The other day I had two lists of monoidal values that I wanted to combine in a certain way, and I realized it was an instance of this more general pattern: > {-# LANGUAGE GeneralizedNewtypeDeriving #-} > import Data.Monoid > … Continue reading

Posted in haskell | Tagged , , , | 8 Comments

Call for contributions: second edition of the Typeclassopedia

The Typeclassopedia, by all accounts, has turned out to be a popular and useful resource for Haskell programmers. I’ve been thinking for a while about putting out a revised and expanded second edition, and it’s finally time. Planned changes include: … Continue reading


Posted in haskell, writing | Tagged , , , , | 17 Comments