Classes and Interfaces
Learn about the relationship between classes and interfaces in object-oriented design patterns.
We'll cover the following...
Relationship between classes and interfaces
There is a very strong relationship between classes and interfaces, particularly in object-oriented design patterns. An interface describes a custom type and can include both properties and functions. A class is the definition of an object, also including its properties and functions. This allows us to use interfaces to describe some common behavior within a set of classes and write code that will work with this set of classes.
As an example of this, consider the following class definitions:
// Define a class ClassA with a method printclass ClassA {// Method print with a void return typeprint(): void {// Log message indicating that ClassA.print has been calledconsole.log(`ClassA.print() called.`)};}// Define a class ClassB with a method printclass ClassB {// Method print with a void return typeprint(): void {// Log message indicating that ClassB.print has been calledconsole.log(`ClassB.print() called.`)};}
Class definitions
Here, we have class definitions for two classes, named ClassA
(lines 2–8) and ClassB
(lines 11–17). Both of these ...