Learning TypeScript 2.x - Second Edition

Mixins (multiple inheritance)

Sometimes, we will find scenarios in which it would be useful to be able to declare a class that inherits from two or more classes simultaneously (known as multiple inheritance).

We are going to create an example to demonstrate how multiple inheritance works. We are going to avoid adding any code to the methods in this example because we want to avoid the possibility of getting distracted by the details. We should focus on the inheritance tree.

We are going to start by declaring a class named Animal that has only one method, named eat:

class Animal { 
  eat() { 
    // ... 
  } 
} 

After declaring the Animal class, we are going to declare two new classes named WingedAnimal and Mammal. Both classes are inherited from the ...