Define Constructor

Constructors in JavaScript are special functions designed to initialize objects. They are invoked with the new keyword and are responsible for setting up the initial state (properties) and behavior (methods) of newly created objects. Conventionally, constructors start with an uppercase letter to distinguish them from regular functions.

Points:

• Constructors are functions used to create and initialize objects.
• They are invoked using the new keyword followed by the constructor function name.
• Constructors define the initial state (properties) and behavior (methods) of objects.
• They are defined using regular functions.
• It's a convention to start constructor function names with an uppercase letter.

Syntax:

function ConstructorName(parameter1, parameter2, ...) {
    this.property1 = parameter1;
    this.property2 = parameter2;
    // Other property assignments
    
    this.methodName = function() {
        // Method implementation
    };
}

// Optionally, add methods to the prototype
ConstructorName.prototype.methodName = function() {
    // Method implementation
};

Example:

// Constructor function for creating Car objects
function Car(make, model) {
    this.make = make; // Initialize the 'make' property
    this.model = model; // Initialize the 'model' property
    
    // Method defined inside the constructor
    this.drive = function() {
        return "Driving a " + this.make + " " + this.model + ".";
    };
}

// Creating instances of Car using the constructor
let car1 = new Car( "Renault","Kwid");
let car2 = new Car("Honda", "Accord");

// Calling the drive method on instances
console.log(car1.drive()); // Output: Driving a Toyota Camry.
console.log(car2.drive()); // Output: Driving a Honda Accord.