Extends vs Implements

class Person {
  name: string;
  age: number;
}

class Child extends Person {}
class Man implements Person {}

extends vs implements

extends is more for inheritance

• one object acquires all the properties and behaviors of the parent object

implements is more for polymorphism

• polymorphism is a provision of a single interface to entities of different types

extends extends a class

New class is a child

implements implements an interface

New class is the same shape, but not a child of the class

Class implements one or more interfaces

• It enforces the class adheres to the structure defined by the interfaces it claims to implement

When a class implements an interface, it must provide implementations for all the methods and properties defined in that interface.

• If the class fails to provide the required implementations, a compilation error will occur

interface Printable {
  print(): void;
}

class Book implements Printable {
  print() {
    console.log("Printing book...");
  }
}

class Magazine implements Printable {
  print() {
    console.log("Printing magazine...");
  }
}

const book = new Book();
book.print(); // Output: Printing book...

const magazine = new Magazine();
magazine.print(); // Output: Printing magazine...