Simo Råman

Building Roguelike in F#

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I know many people who started programming because they wanted to write a game of their own. I myself had never done game programming but after I ran into articles about programming a roguelike in Haskell I decided to give it a try using F#.

First I wanted to get hero to move around on map.

These are the types I . . .

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Posted in: f#roguelike

May 19, 2015

Generating music in F# part 3: Note values

Previous posts in series:
Part 1
Part 2

After last post the program can generate melodies using Markov chains generated from seed data. Next important aspect of a catchy melody is note value. Note value means a relative duration of a note.

Just like notes note values are modelled as a type:

type value =
 |  . . .

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Posted in: f#

April 04, 2015

Generating music with F# part 2: Markov chains

Continuing from the previous post.

To make melody generation more interesting I decided to try applying statistical process called Markov chain. In the context of this post by Markov chain I mean that the next state of the system is not completely random but next states have different probabilities that depend on the current state.

. . .

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Posted in: f#

March 29, 2015

Generating music with F#

For a long time I have been fascinated with the idea of generating music programmatically. I decided to give it a go using F# and this is what I came up with. I wrote a program that generates a short melody in the key of C major. Not exactly Mozart, but it's a start.

I created a type for notes and a Map of notes to their . . .

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Posted in: f#

March 22, 2015

Test Driving F#: String Calculator Kata

I finally took the time to code some F# again. This time I tried out Roy Osherove's String Calculator kata.

This was the first time I did development on a Mac using Mono. The experience was surprisingly pain-free. The biggest problem I had was MonoDevelop hanging when debugging. I was afraid that I would have to setup external . . .

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Posted in: f#

November 03, 2013

Test driving F#: Bowling game

(published originally February 1, 2013 at

Some time ago I blogged about my first experience with F#. I took a course Functional Programming Principles in Scalarecently and it somewhat opened my eyes on problem solving in functional style. After that I felt confident enough to do something more complex than fizzbuzz with F# so the logical next step was Bowling game kata.

. . .

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Posted in: f#

February 01, 2013

Test driving F#: FizzBuzz

(published originally September 19, 2012 at

I have been interested in F# for a long time, but haven't taken the time to actually do anything with it. Finally I decided to try and use it to implement the good old FizzBuzz. I used fsUnit as a unit test framework.

Here are the tests I ended up with:

type ``When to Fizz`` ()=

 [< . . .

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Posted in: f#

September 19, 2012


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