JavaScript Polymorphism Tutorial

About This Tutorial

Polymorphism is one of the core principles of object-oriented programming that allows objects of different types to be treated uniformly through a common interface. In JavaScript, polymorphism enables you to write flexible, extensible code that works with multiple object types without knowing their specific implementation details.

Unlike statically-typed languages that enforce polymorphism through inheritance and interfaces, JavaScript uses duck typing - "if it walks like a duck and quacks like a duck, it's a duck." This dynamic approach makes polymorphism natural and powerful in JavaScript, allowing you to write code that adapts to different object shapes seamlessly.

What You'll Learn

• Understand what polymorphism means in JavaScript
• Master duck typing and structural typing patterns
• Implement polymorphic functions that work with multiple types
• Use method overriding and interface-based design
• Apply polymorphism to real-world scenarios
• Recognize when polymorphism improves code quality

Prerequisites

Understanding of JavaScript objects and functions. Familiarity with ES6 classes is helpful but not required. Basic knowledge of object-oriented programming concepts is beneficial.