Classes and Prototypes in JavaScript

 Classes and Prototypes in JavaScript

Classes and prototypes are two ways to define objects in JavaScript. Classes were introduced in ES6, while prototypes have been a part of JavaScript since its inception.

Here's an example of how to define an object using a prototype:

javascript

function Person(name, age) {

  this.name = name;

  this.age = age;

}

Person.prototype.sayHello = function() {

  console.log("Hello, my name is " + this.name + " and I am " + this.age + " years old.");

}

var john = new Person("John", 30);

john.sayHello(); // prints "Hello, my name is John and I am 30 years old."

The Person function defines the object's properties, and the sayHello method is added to the object's prototype.