I came across this SO question the other day, and I really liked Daniel’s answer as it illustrates the beauty and elegance of F# and functional programming in general! Personally I love the combinators approach, and for anyone else who’s interested to see what else you can do with combinators, check out the beautifully crafted …
After watching Gael’s recent SkillsMatter talk on multithreading I’ve put together some notes from a very educational talk: Hardware Cache Hierarchy Four levels of cache L1 (per core) – typically used for instructions L2 (per core) L3 (per die) DRAM (all processors) Data can be cached in multiple caches, and synchronization happens through an …
Takeaways from Gael Fraiteur’s multithreading talk Read More »
I have heard a few people argue that when it comes to performance critical code you should prefer arrays over other collections (such as F#’s lists) as it benefits from sequential reads (which is faster than seeks) and offers better memory locality. To test that theory somewhat, I wanted to see if there is any …
F# – Speed test iter and map operations with array vs list Read More »
I gave a talk about Aspect Oriented Programming at this year’s DDD South West, the slides is available on SlideShare: Introduction to Aspect Oriented Programming (DDD South West 4.0) View more PowerPoint from Yan Cui The source code I used can be found here. A big thank you to the guys for making DDD …
To find out if a string contains a piece of substring, here are three simple ways of going about it in C#, just to name a few: String.Contains String.IndexOf where the return value is >= 0 Regex.IsMatch Out of curiosity I wanted to see if there was any noticeable difference in the performance of each …
Performance Test – String.Contains vs String.IndexOf vs Regex.IsMatch Read More »
Problem A. Speaking in Tongues The problem is here. Problem B. Dancing with the Googlers The problem is here. Problem C. Recycled Numbers The problem is here. Enjoy!
I found out about Google CodeJam the other day, and looking at their info page, there’s a number of interesting problems you can solve as practice for the real thing coming up, and here are my F# solutions to the qualification round questions from the 2010 event, enjoy Problem A. Store Credit The outline …
F# solutions to Google CodeJam 2010 Qualification Round Problems Read More »
Again, I’d like to thank Igal Tabachnik and SharpCrafters for inviting me to do the webinar, the recording of the session is now available on their Vimeo channel. Pseudo Real Time Performance Monitoring with AOP and AWS CloudWatch from SharpCrafters on Vimeo. Performance Monitoring with AOP and Amazon CloudWatch View more PowerPoint from Yan …
To find the answer to this question I put together a very simple test, but before we go into it.. Disclaimer: this test and its result should be taken at face value only, it is intended to illustrate that posting messages to an agent is super lightweight, but in a real world application there will …
F# – How many messages can you post to a F# agent in one second? Read More »
One of the problems with using F#’s Discriminated Unions is that they are not extensible, in that all your union cases must be specified inside one Discriminated Union (abbreviated to DU from this point) type and you can’t inherit from an existing DU type to add additional union cases. In most cases, having to specify …
F# – Extending Discriminated Unions using marker interfaces Read More »
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