Composition vs inheritance in NextJS - When to Use Which

The Big Idea

Discover why mixing small parts beats copying big chunks in your code!

The Scenario

Imagine building a website where you copy and paste code to reuse features, then try to fix bugs in many places.

The Problem

Copying code everywhere makes updates slow and causes mistakes. Inheritance chains can get tangled and hard to follow.

The Solution

Composition lets you build small pieces and combine them flexibly, avoiding complex inheritance and making code easier to manage.

Before vs After

✗ Before

class Button extends BaseButton { render() { return <button>{this.props.label}</button>; } }

✓ After

function Button({ label }) { return <button>{label}</button>; }

What It Enables

Composition enables building UI from simple, reusable parts that fit together cleanly and adapt easily.

Real Life Example

Think of a car made from parts like wheels and engine instead of inheriting from a generic vehicle; you can swap parts easily.

Key Takeaways

Inheritance can create rigid, complex code structures.

Composition builds flexible, reusable components.

Next.js apps benefit from composition for clearer, maintainable UI.