rich has written 8 posts for

Functional Design Patterns in Scala: Monoids

Monoids are used to describe an aggregation pattern: whenever we need to combine values of a particular type, a monoid instance helps abstract the mechanics of the aggregation from the program’s business logic. In this post, we will use the LCD Digits kata that we tackled previously as a motivating example for applying this pattern. […]


Scrap the Boilerplate in Scala with Lenses

Case classes provide a convenient way of working with immutable objects in scala. Manipulating fields within them can be tedious, however. In this post, we will look at how lenses can be used to abstract over this complexity while preserving the benefits of immutability. (more…)

planning poker cards

Agile Estimation For Distributed Teams

The scrum teams I work with use Planning Poker to estimate the size of user stories. This has proved to be an extremely useful technique, and we rely on it to plan work for upcoming sprints. In the past, we used special card decks for these games, which worked well when everyone was based in […]


Steve Reich’s Clapping Music with Scala and Akka

Using functions to express musical ideas is nothing new: Harmony, time signatures, the relations between notes in a scale and musical form all have their roots in mathematics, and composers have used mathematical abstractions for millennia (see Pythagorean Tuning for a 2500-year-old example). These abstractions, however, are not always obvious from they way that music is written down, […]


LCD Digits with Scala

I recently attended one of the coding dojos run by the London Scala User Group. It was great fun, and I’d recommend getting involved to anyone who’s interested in meeting other developers and learning more about scala and functional programming. After breaking into groups, we set about tackling the ‘LCD Digits’ problem from Although […]

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Richard Ashworth
Technical Lead at Goodlord
Experienced software engineer and technical lead. Passionate about functional programming, agile methods and domain-driven design. Check out my blog at


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