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Developers considering attacking such problems with a functional language may wonder about performance, the look of the resulting code or simply why they would want to do it that way. The personal experiences and lessons learnt from these endeavours may shed some light.
Both projects are intentionally exaggerations of what one might want to use Scala for in practice, but even as learning projects, there are points of wider interest: how functional purity can be usefully sacrificed in the worst bottlenecks, how design of types is key to performance, and how expressing a problem functionally, despite the toil, is possible and satisfying and very often makes it clearer.
In getting both of these applications to work Danielle also hopes to give counterexamples to the perception held by some that Scala is necessarily slow, inefficient or uncool.
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Danielle took up functional programming in Scala a few years back as a mental challenge and much enjoyed it since, with gratitude to the great people she met on the way. Alongside Scala being the day job, she has an amateurish inclination to look at unusual domains with FP in the misguided conviction that there has to be a 'clever' solution for every problem.