JavaScript Interview Question #104

What is the prototype in JavaScript?

Closures, Prototypes, Classes & Advanced Functions Mid-Level Intermediate

Quick Interview Answer

JavaScript objects can have an internal link to another object called their prototype. When a property is not found directly on an object, JavaScript can search its prototype and continue through the prototype chain.

Detailed Explanation

Prototypes provide JavaScript's inheritance and shared-behavior mechanism. Methods placed on a constructor's prototype can be shared by all instances instead of creating a separate function object for every instance.

Code Example

function User(name) {
    this.name = name;
}

User.prototype.greet = function () {
    return `Hello ${this.name}`;
};

const user = new User("Asif");

console.log(user.greet());