In an effort to better understand parsing in the Haskell world, I decided to port a hand-crafted parser I’d written for Subversion dump files in C++11 into a Haskell version. It’s not that the old parser didn’t work well, but I wanted to see what Haskell could make of the problem with its laziness and combinator-oriented parsing libraries. If you [...]

The Free Monad is something I’ve been having a great deal of difficulty wrapping my head around. It’s one of those Haskell concepts that ends up being far simpler than any of the articles on the Net would have you think. So, here’s a whirlwind tour of this Monad and how it can be super handy. First, imagine you’re building [...]

Yesterday’s artice on Monads in pictures has been translated into Japanese by Eugene Yokota. Many thanks to Eugene for such a rapid translation! [...]

This is not a tutoral on monads, nor will I use any math terms here. This is for people who have learned enough about monads to use them, but want to get a better picture of what they’re doing and why they exist. Functions One way to develop a first intuition about monads is to follow the progression of abstractions [...]

The artice on Git that I wrote a couple years back, Git From the Bottom Up, has been translated into Japanese by Noriyuki Komatsuzaki. Thank you so much, Noriyuki! [...]

The following is an amalgam of several letters I sent to Richard Stallman, founder of the free software movement, expressing my concern about the direction GPL licensing is taking, and why I disagree with some of the objectives of the Free Software Foundation. [...]