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This blog has moved away from the Hashnode platform. Going forwards new posts will published on: https://blog.daniel-beskin.com If you subscribed to the RSS feed it should work with the same URL as before. If you subscribed via email you should be au...
Way back in December, in the spirit of the times (it seems that everyone was either solving Advent of Code or looking for a job), like an elephant in a china shop, I found myself solving a leetcode-style problem. Before I say anything else1, I would ...
Given this class: case class User( id: UserId, email: Option[Email], address: Option[Address], posts: Option[List[Post]], lastLogin: Option[Timestamp]) What does Option on each of the fields actually means? Well, after spending hours diggi...
I've recently stumbled upon a post on Scala Contributors by Kit Langton describing how he managed to create the illusion of adding automatically derived (publicly visible) members to a companion of a class. Something that's no longer possible to achi...
The Tip The Scala collections library defines an Iterator trait. As you might expect, a typical Iterator's implementation relies on mutable state. And so for the today's tip: Beware of leaking Iterator instances outside the scope you initialized it ...
The Problem Imagine that you're building an app and somewhere in your code you write something like this: class DoFinanceStuff(cc: CreditCardService): def grabClientMoney(card: CardData) = val amount = // ... // ... cc.processPayment...
Welcome back to yet another episode of test purification. In the last part we explored another benefit of adding type parameters to our code, the ability to work with very lean mocks. It's been a while since the last part, so please take a look there...
This is not just clickbait, I really do mean that ANY form overloading in programming should be considered evil. By "overloading" I shall refer to any instance of using one name to refer to multiple different things1. A common example would be operat...
In the last part we saw how to make our code more declarative, and the tests more functional by introducing type parameters for the inner data flowing through our code. In this part we are going to make our test inputs leaner. Previously... Recall th...
