constructor function: A constructor function will help you to create objects

function display(){
	console.log(this);
}

display() // it will refering to the global window object === this

new display() // it will refer to an empty object. basically, whenever we call any function along with the new keyword, it will create an empty object and return the "this"

function productInfo(name, color, price, discount) {
	this.name = name;
	this.color = color;
	this.price = price;
	this.discount = discount;
	
	this.displayProductInfo = function () {
		console.log(`Product Name is ${this.name} color is ${this.color} price is ${this.price} and discount is ${this.discount} %`);
	};
	
	this.getDiscount = () => {
		console.log(`total discountis ${this.discount}%`);
	};
}

const mi = new productInfo("MI", "Black", "19k", 10);
const vivo = new productInfo("VIVO", "GRAY", "19.6k", 20);

mi.displayProductInfo();

Note: You can access the parameters directly, but if you want to access the normal properties, you must access them through the "THIS" keyword

The disadvantage of a constructor function, if we declare a method, it will allocate memory for every constructor function. Suppose we have 500 objects at that time, it will allocate memory for all the constructor functions.

• waste of memory

To overcome this problem through classes or proto object

• -proto-- is an object that will be attached to objects, arrays, classes and functions also

syntax: objectName.proto.method=function

• It will create a common function for all objects.

real-time example: mould

Factory function :

• A factory function is just a function that creates objects and returns them.
• Factory function is a design pattern.

Problem: code duplication