Three Useful Monads - adit.ioWritten June 10, 2013 Note: before reading this, you should know what a monad is. Read this post if you don't! Here's a function half: And we can apply it a couple of times:
Building A Concurrent Web Scraper With Haskell - adit.io
Written March 10, 2012 updated: April 16, 2012 Introduction Let's make a concurrent web scraper! We will use Haskell, because it allows easy concurrency. We will use the HXT library to do the scraping. If you want to follow the HXT bits, you should be comfortable with Arrows in Haskell. If you're not, take a moment to read up on Arrows. If you don't care about the scraping bits, jump straight to t
Locks, Actors, And Stm In Pictures - adit.io
Written May 15, 2013 All programs with concurrency have the same problem. Your program uses some memory: When your code is single-threaded, there's just one thread writing to memory. You are A-OK: But if you have more than one thread, they could overwrite each others changes! You have three ways of dealing with this problem: Locks Actors Software Transactional Memory I'll solve a classic concurren
Functors, Applicatives, And Monads In Pictures - adit.io
Written April 17, 2013 updated: May 20, 2013 Here's a simple value: And we know how to apply a function to this value: Simple enough. Lets extend this by saying that any value can be in a context. For now you can think of a context as a box that you can put a value in: Now when you apply a function to this value, you'll get different results depending on the context. This is the idea that Functors
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Lenses In Pictures - adit.io
