In this blog post we’ll learn: How to define derived and custom serialisers & deserialisers for reading and writing domain ADT-s from and to JSON. How to combine domain ADT Smart Constructors with custom JSON readers for ensuring the data correctness. We’ll make use of play-json library, so before diving…

Data validation is no new thing in software development, it’s been here all along and will continue to stay with us. Comprehensive data validation leads to achieving the following goals: Disallowing anyone to represent the illegal state in our apps Accumulating all of the exact reasons for the validation failure…

Back to biznisss! 😌 🤓 scala.util.Using 🤓 A data structure which manages resources automatically. It lets us focus on the task at hand by giving us a handle on the acquired resource which is then automatically released in the end so that we avoid resource leaks. Let’s say we want to read a…

In this blogpost while evangelising immutability we end up creating a useful reusable piece of code as a side effect which addresses the limitations of Either[+E, +A] in Scala standard library with respect to performing accumulative data validations. A bold statement which I’ll justify later: “Immutable State is king!” Functional…

It is an article about Functional error handling which will Either turn out to be Success or Failure. In my opinion it is Right to say that you have None to lose and Some to gain if you read it. …

Data engineering, Big Data, Data lakes, Databases, Data warehouses, Data streaming, Data pipelines… How many such terms do you need to hear until you’re convinced that we are indeed living in the age of Data? It is pity that the majority of mainstream programming languages realised only later that it…

Sooner or later you will stumble upon the concept of type classes while traversing your Scala journey. …

Invariant? Covariant? Contravariant?… What the F[_]?! Scala programming language has an extremely powerful feature called “Variance”. Variance, if used properly can guarantee us to benefit from the increased ability of the compiler to infer types at compile time. It saves us from adding type annotations to every single expression manually…