more indirection

The Play framework's default persistence framework, Anorm , is a very thin wrapper around JDBC (the whole library is about 800 lines o...

I should also say, there's really nothing wrong in just coding the imperative algorithm in Scala. It's not a sacrilege to use imper...

In general, I'm pretty skeptical of the purported benefits of test-driven development. Nevertheless, there are cases where some unit tes...

A while back, when I was first picking up Scala, I needed to prompt the user for a line of text and keep prompting until I got a non-blank l...

In pre-0.10 versions of sbt, you could use sbt-idea-plugin to generate IDEA projects from your SBT files. That plugin doesn't work in 0....

The latest release of sbt (version 0.10) is utterly incompatible with build scripts from older versions of SBT. Here's how to migrate a...

From the excellent Deprecating the Observer Pattern by Odersky et al: // step 1: val path = new Path((self next mouseDown).position) //...

I've been hearing chatter about node.js in the last few months. A few weeks ago, a colleague gave me a quick demo and I decided to take...

A few days ago, parallel-io was uploaded to Hackage. Previously, when I wanted to perform a number of I/O actions in parallel, I used som...

I've been wanting to try Leksah for some time, but found that it doesn't give you many cues about how to get started when you first ...

Can anyone recommend a good way to get Haskell syntax highlighting for blog posts? I've been using Gist, which works very well, except ...

I give permission to include this blog and its contents on the Planet Haskell aggregator.

Prompted by a question on haskell-cafe, here's a relatively concise word-wrapping implementation I wrote: Update : Thanks to Yitz in t...

If you want to browse the source code of a package on Hackage, "cabal unpack" is a useful command. packages % ls packages % caba...

Recently, I came across a problem in a Haskell script I run frequently. Every so often, I drop a report file into a designated folder. Then...

I am sometimes surprised by the strokes of genius hidden inside Haskell's type system. For example: the Maybe type. Maybe a is a para...