Class Basics

Class Basics

A class is a blueprint for creating objects with properties and methods.

Creating a class

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
  describe() {
    return this.name + " is " + this.age;
  }
}

The constructor

The constructor method runs automatically when you create an object with new. It sets up the object's initial properties.

Creating objects

const ada = new Person("Ada", 36);
const bob = new Person("Bob", 40);
ada.describe(); // "Ada is 36"

Class methods

Methods are functions defined inside the class. They use this to access the object's properties.

Class vs constructor function

Classes are a modern, cleaner way to do what constructor functions did. They use the same new keyword.

TL;DR

• A class is a blueprint for objects.
• The constructor sets up initial properties.
• Methods define behavior.
• new ClassName() creates an object.