I spent the last couple of nights putting together a simple Markdown to PDF formatter using Tomas Petricek’s FSharp.Formatting project and the PdfSharp-MigraDoc library. To use this library, you can either grab the source from the GitHub repository or get it from Nuget using the following command: F# Usage To use the library from F#, …
F# – PDF fun with Markdown and FSharp.Formatting Read More »
After a long Easter holiday filled with late night coding sessions I find myself wide awake at 2am… good job I’ve still got my pluralsight subscription and a quick look at the Algorithms and Data Structures course again at least gave me something to do to relax the mind with some back-to-school style implementation of …
This is a F# implementation of the fast algorithm to count the number of inversions in an array, outlined in the Algorithms : Design and Analysis Part 1 course on Coursera.
Here’s a simple F# implementation of the merge sort algorithm (using mutable arrays) outlined in the Algorithms : Design and Analysis Part 1 course on Coursera. So refreshing to be writing simple sorting algorithms years after university, still fun!
With the official release of .Net 4.5 and Visual Studio 2012, I suspect many .Net developers will be rushing to rewrite their data access or network layers (amongst many many other things!) to take advantage of the new async-await (see the excellent 101 examples here) language feature in C#, which means you’ll likely be working …
F# – helper functions to convert between Async<unit> and Task Read More »
In Erlang, we have the Supervisor behaviour which makes it very easy to provide the means to monitor and restart a whole network of workers and other supervisors based on some configured strategy. The MailboxProcessor (aka agents) in F# doesn’t come with the same higher-level abstractions (such as Erlang’s gen_server, gen_fsm behaviours) by default, but …
This is a list of my takeaways from the excellent talk between Erik Meijer (of the LINQ and Rx fame), Carl Hewitt (creator of the Actor model) and Clemens Szyperski, on the Actor model. Disclaimer : this conversation revolves around the conceptual model of an actor, as opposed to specific implementations of the Actor …
Takeaways from Hewitt, Meijer and Szyperski’s talk on the Actor model Read More »
You can specify a function which can take in a numeric value with a generic unit of measure easily enough: Similarly, you can also specify a discriminated union whose clauses can be of a numeric value with a generic unit of measure, like this:
Peculiarly I couldn’t find any documented way to create a type extension for a generic array, ‘a [ ], turns out you need to use backtick marks ( ` ) around the square brackets in order to do that:
Considering a very simple finite state machine (FSM) such as a code lock which requires you to enter a 4-digit numeric code and upon which will open the lock for a brief few seconds. Such a FSM have two states: Locked and Open. Every time a key is entered it checks the sequence of digits …
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