Contravariance

Back2Basics: Demystifying Variance

May 3, 2018May 9, 2018Scala, Tutorialback2basics, Contravariance, Covariance, Functional Programming, learning, programming, scala, scalafp, Upper Bound, Variance

In this blog, we will explore types of variances in Scala. In-variance Co-variance Contra-variance First, let’s talk about Types in Scala. scala> import java.util.ArrayList scala> var ref1: Any = “Hi” ref1: Any = Hi scala> var ref2: String = “Hi” ref2: String = Hi scala> ref1 = ref2 ref1: Any = Hi In the above example, ref1 is of type Any and ref2 is of Continue Reading

Back2Basics: Scala Type System in Depth

April 16, 2018April 19, 2018Scalaback2basics, Bounds, Contravariance, Covariance, Type paramterization, Variance

In this blog, I will put emphasis on the power and awesomeness of the Scala Type System. Also, I will try to reiterate that it is not difficult or complicated as perceived. In layman terms, the Scala Type system helps us keep the code tidy and type safe. So in this blog, I shall take you through the following : Parameterized types In-Variance Co-Variance Contra-Variance