Prototype in Javascript

Prototypes are a fundamental concept in JavaScript that allow objects to inherit

properties and methods from other objects.

Every JavaScript object has a prototype, which is another object that it inherits

properties and methods from.

When a property or method is accessed on an object, JavaScript first looks for

that property or method on the object itself.

If its not found, JavaScript then looks for it on the objects prototype.

If the property or method is not found on the prototype, JavaScript continues

up the prototype chain until it reaches the top level

Object.prototype object.

function Person(first, last, age, eyecolor) {

this.firstName = first;

this.lastName = last;

this.age = age;

this.eyeColor = eyecolor;

this.name = function (){

return this.firstName

}

}

Person.prototype.name = function() {

return this.firstName + " " + this.lastName;

};

var p = new Person("sangram","desai",42,"black")

console.log(p.name())

Output:

sangram

If we comment out name function inside Person method then it will call prototypes

name metho and output will be

sangram desai

When we call any method on object it first look into that object if not found then

look into its prototype.