What is Polymorphism in JavaScript?

Polymorphism is a concept in object-oriented programming that refers to the ability of objects of different classes to respond to the same method call in a way that is appropriate for the object’s class. In JavaScript, polymorphism can be achieved through function overloading, method overriding, and function overriding.

Function overloading refers to the ability to create multiple functions with the same name, but with different parameters. This allows different implementations of the same function to be called based on the arguments passed in. However, JavaScript does not support function overloading natively.

Method overriding refers to the ability of a subclass to provide a new implementation of a method that is already defined in its superclass. This allows objects of the subclass to have a different behavior when a method is called, compared to objects of the superclass. JavaScript supports method overriding through prototypal inheritance.

Function overriding refers to the ability to override the behavior of a function globally by redefining its implementation. This can be useful for modifying the behavior of built-in functions or functions defined in external libraries.

In JavaScript, polymorphism can be achieved through these techniques, allowing objects of different classes to respond to the same method call in a way that is appropriate for their class. This helps to create more flexible and reusable code.