Difference Between Function Overloading and Function Overriding in JavaScript Last Updated : 02 Jul, 2024 Comments Improve Suggest changes Like Article Like Report Function overloading and function overriding are two important concepts in object-oriented programming (OOP). Function overloading allows the creation of multiple functions with the same name but different parameters. Function overriding allows the subclass or child class to provide the specific implementation of the method that is already defined in its superclass or parent class.These are the following topics that we are going to discuss:Table of ContentWhat is Function Overloading?What is Function Overriding?Difference Between Function Overloading and Function Overriding in JavaScriptWhat is Function Overloading?Function overloading is the ability to create multiple functions with the same name but different parameters. However, JavaScript does not natively support function overloading as seen in languages like C++ or Java. Instead, we can achieve a similar effect using the workarounds such as the checking the number and types of the arguments within the single function definition.Example: In the below example, the display function behave differently based on type of its argument. JavaScript function display(value) { if (typeof value === 'number') { console.log("Number: " + value); } else if (typeof value === 'string') { console.log("String: " + value); } } display(32); display("Hello"); OutputNumber: 32 String: Hello What is Function Overriding?The Function overriding occurs when a subclass or child class provides the specific implementation for the method that is already defined in its superclass or parent class. This allows a subclass to the tailor the method to its own needs. Function overriding in JavaScript allows a subclass or child class to provide a specific implementation of a method that is already defined in its superclass or parent class. This enables the child class to show the behavior of the inherited method that can be manipulated by the child class itself. Example: The Child class overrides the display method of the Parent class. When the display method is called on the instance of Child and overridden method in the Child class is executed. JavaScript class Parent { display() { console.log("Display method from Parent class"); } } class Child extends Parent { display() { console.log("Display method from Child class"); } } let obj = new Child(); obj.display(); OutputDisplay method from Child class Difference Between Function Overloading and Function Overriding in JavaScriptCharacteristicsFunction OverloadingFunction OverridingDefinition The Multiple functions with the same name but different parameters. The Subclass provides the specific implementation of a method already defined in its superclass.Native Support Not natively supported in JavaScript achieved through workarounds. The Natively supported using the class inheritance.Purpose To allow functions to the handle different types or numbers of the parameters. To allow a subclass to provide the specific implementation for the method.Example Usage Handling the different argument types within the same function. The Customizing or extending the behavior of the method in a subclass.Code Complexity Can increase complexity due to the manual checks of parameters. The more straightforward aligns with the OOP principles. 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