Use of classes in javaScript

In JavaScript, classes provide a way to define blueprints for creating objects with similar properties and methods. Introduced in ECMAScript 2015 (ES6), classes offer a more structured and familiar syntax for working with objects, similar to class-based languages like Java or Python. Here's an example:

            // Defining a class
            class Car {
              constructor(make, model, year) {
                this.make = make;
                this.model = model;
                this.year = year;
              // Method defined inside the class
              getDetails() {
                return `${this.year} ${this.make} ${this.model}`;
            // Creating an instance of the class (object)
            let myCar = new Car('Toyota', 'Corolla', 2022);
            // Using the class method
            console.log(myCar.getDetails()); // Output: 2022 Toyota Corolla            

Here's what's happening:

  • The class keyword is used to define a class named Car. It has a constructor method that gets called when a new object is created. This method initializes the object's properties (make, model, year) when a new Car object is instantiated.
  • Inside the class, there's a method getDetails() that returns a formatted string using the object's properties.
  • An instance of the Car class is created using the new keyword, passing in arguments for the make, model, and year.
  • The instance myCar has access to the properties and methods defined within the Car class.

Classes in JavaScript are a syntactical sugar over the prototype-based inheritance system that JavaScript traditionally used. Underneath, classes are still based on prototypes. They provide a clearer and more organized way to define object blueprints and their methods.

It's important to note that while classes in JavaScript offer a more familiar syntax for developers coming from class-based languages, JavaScript remains a prototype-based language at its core. Classes provide a convenient way to work with objects but are still built on top of JavaScript's prototypal inheritance.

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