criterion 1.0
Almost five years after I initially released criterion, I'm delighted to announce a major release with a large number of appealing new features. As always, you can install the latest goodness using cabal install criterion, or fetch the source from github. Please let me know if you find criterion useful! New documentation I built both a home page and a thorough tutorial for criterion. I've also ext
A major upgrade to attoparsec: more speed, more power
I’m pleased to introduce the third generation of my attoparsec parsing library. With a major change to its internals, it is both faster and more powerful than previous versions, while remaining backwards compatible. Comparing to C Let’s start with a speed comparison between the hand-written C code that powers Node.js’s HTTP parser and an idiomatic Haskell parser that uses attoparsec. There are goo
wreq: a Haskell web client library
wreq is a library that makes HTTP client programming in Haskell easy. Features Simple but powerful lens-based API Over 100 tests, and built on reliable libraries like http-client and lens Session handling includes connection keep-alive and pooling, and cookie persistence Automatic decompression Powerful multipart form and file upload handling Support for JSON requests and responses, including navi
Book review: Parallel and Concurrent Programming in Haskell
It's time someone finally wrote a proper review of Simon Marlow's amazing book, Parallel and Concurrent Programming in Haskell. I am really not the right person to tackle this job objectively, because I have known Simon for 20 years and I currently happen to be his boss at Facebook. Nevertheless, I fly my flag of editorial bias proudly, and in any case a moment's glance at Simon's book will convin
Testing a UTF-8 decoder with vigour
Yesterday, Michael Snoyman reported a surprising regression in version 1.0 of my Haskell text library: for some invalid inputs, the UTF-8 decoder was truncating the invalid data instead of throwing an exception. Thanks to Michael providing an easy repro, I quickly bisected the origin of the regression to a commit from September that added support for incremental decoding of UTF-8. That work was mo
Open question: help me design a new encoding API for aeson
For a while now, I’ve had it in mind to improve the encoding performance of my Haskell JSON package, aeson. Over the weekend, I went from hazy notion to a proof of concept for what I think could be a reasonable approach. This post is a case of me “thinking out loud” about the initial design I came up with. I’m very interested in hearing if you have a cleaner idea. The problem with the encoding met
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Win bigger statistical fights with a better jackknife
New year, new library releases, new levels of speed
What’s good for C++ is good for … Haskell!?