Composition with Structs

Before we test complex scenarios, we have to learn more about structs and composition. These two concepts are mandatory to implement the dependency injection pattern and write loosely-coupled software.

Inheritance vs. composition

Go doesn’t support inheritance. Inheritance can be defined as a hierarchical relationship between parent and child classes. In practice, child classes inherit the fields, properties, and methods of parent classes. In Go, we don’t have classes, so this concept can’t be applied. Instead of classes, we have structs, and in place of inheritance, we have composition.
Let’s visualize the difference between these two terms:

The above pattern is pretty common in ...