JavaScript is a prototype-based language, which allows objects to inherit properties and methods from other objects. In this chapter, we will explore the prototype system in JavaScript and how it is used to implement inheritance.

Prototype in JavaScript

Prototypes in JavaScript

Each object in JavaScript has a prototype, which is another object from which it inherits properties and methods. This allows objects to share functionality without duplicating code.

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Constructor and prototype

Constructors are functions that allow creating multiple instances of an object with similar properties. Using the prototype property, we can define methods that will be shared among all instances.

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Inheritance in JavaScript

We can create a chain of prototypes to implement inheritance, allowing an object to inherit properties from another.

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Classes and Inheritance Syntax

With ES6, JavaScript introduced a clearer syntax for working with inheritance through the class keyword.

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Method Overriding

When a child class needs different behavior, it can override an inherited method.

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instanceof and isPrototypeOf

JavaScript offers instanceof and isPrototypeOf to check inheritance relationships.

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Conclusion

Prototype manipulation and inheritance in JavaScript are key concepts for building modular and reusable applications. Understanding how the prototype system works allows you to write more flexible code and leverage JavaScript's inheritance model.