Neil Mitchell's Blog (Haskell etc)

My website is now located at ndmitchell.com and has a few new talks on it: Slides and Video from Gluing things together with Haskell give...

Summary: I found a nasty bug in GHC 7.10 RC3. It's been fixed. For Shake , I have an extensive test suite (2500+ lines of tests). I also...

Summary: Implementing a Functor instance is much easier than implementing a Monad instance, and can turn out to be quite useful. Haskell for...

Summary: Currently you have to call withSocketsDo before using the Haskell network library. In the next version you won't have to. The ...

Summary: Don't use nub . A much faster alternative is nubOrd from the extra package. The Haskell Data.List module contains the functi...

Summary: Hoogle 4 is out of date. The alpha version Hoogle 5 has fresh code and data every day (and isn't yet ready). Someone recently...

Summary: Haskell is great for refactoring, thanks to being able to reason about and transform programs with confidence. I think one of Haske...

Summary: I'm working on Hoogle 5. If you like unfinished software, you can try it . For the last month I've been working on the next...

Summary: When designing a user interface, think about the user, and what they want to know. Don't just present the information you know....

Summary: There is now a minimal Windows GHC installer that can install the network library. Michael Snoyman and I are seeking beta testers f...

Summary: Shake 0.14 is now out. The *> operator became %> . If you are on Windows the FilePath operations work differently. I'm ...

Summary: I wrote a script to list all operators on Hackage, and which packages they are used by. In GHC 7.10 the *> operator will be mov...

Summary: I thought through the issue of upper bounds on Haskell package dependencies, and it turns out I don't agree with anyone :-) The...

Summary: I'll be talking at CodeMesh 2014 on 5th November and FP Days on 20th November. I am giving two talks in London this month: Code...

Summary: I've just released a new version of HLint that can spot an unsafePerformIO which should have NOINLINE but doesn't. I've...

Summary: A few weeks ago Hackage stopped generating docs. I have a script that generates the docs, and also fixes some Haddock bugs. Update:...

Summary: Shake is not like Make, it has different internal state, which leads to different behaviour. I also store the state in an optimised...

Summary: I've written a continuous integration system, in Haskell, designed for large projects. It works, but probably won't scale y...

Summary: Rewriting the Prelude should be done in a separate package and take a few years to complete, hopefully building a consensus and imp...

Summary: For GHC 7.10, Traversable and Foldable are going to be in the Prelude. I missed the original discussion, but I suspect it's a b...