Variance Positions in Scala, Demystified
We’ll take a look at the famous “covariant type occurs in contravariant position” problem, and what we can do about it.
Recent posts
Let’s Talk About the Scala 3 Indentation
Some people love it, some hate it. Scala 3 indented syntax is not that bad, and it might actually help. Let’s take a look at how Scala 3 can change the struc...
Akka Typed: How the Pipe Pattern Prevents Anti-Patterns
Akka Typed has not only made fundamental changes in the actor protocol definitions, but made significant improvements in actor mechanics as well.
Akka Typed Actors: Stateful and Stateless
Akka Typed has fundamentally changed the way we create actors. In this article we’ll look at several ways we can keep state inside Akka actors.
ALL the Joins in Spark DataFrames
It’s obvious that Spark allows us to join tables. What’s not obvious is how many different kinds of joins Spark supports. We explore them in this article.
Broadcast Joins in Apache Spark: an Optimization Technique
Broadcast joins in Apache Spark are one of the most bang-for-the-buck techniques for optimizing speed and avoiding memory issues. Let’s take a look.
Type Lambdas in Scala 3
Exploring a quick but powerful structure in Scala 3 - type lambdas. This will help you think higher-level.
Types, Kinds and Type Constructors in Scala
Scala has a powerful type system. We look at how Scala types can be organized, what type constructors are, and why we should care.
Scala 3: Opaque Types
We discover opaque type aliases in Scala 3 and how we can define new types with zero overhead.
Scala 3 Traits: New Features
This article will continue some of the previous explorations of Scala 3. Here, we’ll discuss some of the new functionality of traits in Scala 3.