He cares about empathy and inclusivity, and about the ethical, social, and ecological consequences of his work. He is the author of The Neophyte’s Guide to Scala. Recently, he published a new book for Scala beginners, Scala from Scratch: Exploration.
The trouble with subtyping: An introduction to typebounds and variance
Many people come to Scala from object-oriented languages with class-based inheritance. Nevertheless the complexity inherent in subtyping is often one of the biggest hurdles for them. In this talk I will explain type bounds, covariance, and contravariance from the ground up.