scala

This tag is associated with 5 posts
sequence

Functional Design Patterns in Scala: Monads

Learning (and subsequently trying to explain) monads has become something of a rite of passage in functional programming. Like many developers, I struggled initially to understand precisely what type of thing monads are, despite using them on an almost daily basis. The most helpful description I have come across is given by Noel Welsh and […]

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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. […]

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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…)

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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, […]

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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 cyber-dojo.org. Although […]

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