Tutorial by Examples

A type class is simply a trait with one or more type parameters: trait Show[A] { def show(a: A): String } Instead of extending a type class, an implicit instance of the type class is provided for each supported type. Placing these implementations in the companion object of the type class all...

This example discusses extending the below type class. trait Show[A] { def show: String } To make a class you control (and is written in Scala) extend the type class, add an implicit to its companion object. Let us show how we can get the Person class from this example to extend Show: class...

Scala's implementation of type classes is rather verbose. One way to reduce the verbosity is to introduce so-called "Operation Classes". These classes will automatically wrap a variable/value when they are imported to extend functionality. To illustrate this, let us first create a simple ...