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Posted At Thu, Oct 19, 2023 9:04 AM

JavaScript Object Prototype

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Table of Contents

1. Introduction to JavaScript Object Prototype
2. What Is a Prototype in JavaScript?
3. The Prototype Property
4. Modifying Object Prototypes
5. Prototypal Inheritance
6. Conclusion

1. Introduction to JavaScript Object Prototype

Understanding JavaScript object prototypes is fundamental to mastering JavaScript's capabilities. Prototypes enable you to share properties and methods among objects, creating efficient and organized code.

2. What Is a Prototype in JavaScript?

In JavaScript, a prototype is an object from which other objects inherit properties and methods. It serves as a blueprint for creating objects, allowing you to define common properties and functions in one place.

3. The Prototype Property

Each JavaScript object has an internal property called [[Prototype]], which points to its prototype object. You can access it using Object.getPrototypeOf() or set it with Object.setPrototypeOf().

const myObject = {};
const myPrototype = { greeting: 'Hello' };

Object.setPrototypeOf(myObject, myPrototype);

console.log(myObject.greeting); // Outputs: Hello

4. Modifying Object Prototypes

You can add properties and methods to an object's prototype, affecting all instances derived from it. This ensures that objects share common behaviors.

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

Person.prototype.greet = function() {
  return `Hello, my name is ${this.name}`;
};

const john = new Person('John');
console.log(john.greet()); // Outputs: Hello, my name is John

5. Prototypal Inheritance

Prototypal inheritance allows objects to inherit properties and methods from their prototypes. When you access a property on an object, JavaScript looks up the prototype chain to find it.

6. Conclusion

JavaScript object prototypes are a powerful feature that simplifies code and enables efficient inheritance. By understanding how prototypes work, you can create more organized and maintainable JavaScript applications.

Next one is learning about JavaScript Built-in Objects.

Click this link! 👇
JavaScript Built-in Objects

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