JavaScript Class Inheritance

Class inheritance in JavaScript allows one class (child/subclass) to inherit properties and methods from another class (parent/superclass). It uses the extends and super keywords and is essential for object-oriented programming.

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Why Use Class Inheritance?

• Code reusability: Share methods and properties between related classes.
• Maintainability: Avoid code duplication.
• Extensibility: Add or override child class behavior.

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Syntax

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Example 1: Simple Inheritance

• Dog inherits makeSound() from Animal.
• Dog has its own method bark().

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Example 2: Using super() in Constructor

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Overriding Parent Methods

Child classes can override inherited methods:

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Calling Parent Methods Inside Overridden Methods

Use super.methodName() to call a parent’s method:

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Key Takeaways

• Use extends to inherit from another class.
• super() calls the parent constructor and methods.
• Inheritance promotes code reuse, structure, and extensibility.
• Child classes can override or extend parent behavior.