Component Design Principles

Good component design is essential for building maintainable React applications. This lesson covers key principles that help you create clean, reusable, and testable components.

Single Responsibility Principle

A component should do one thing and do it well. This makes components easier to understand, test, and reuse.

When to Split Components

Split a component when it becomes too complex or when parts can be reused elsewhere.

Lifting State Up

When multiple components need to share state, lift it to their closest common ancestor.

Component Composition Over Inheritance

Build complex components by composing simpler ones, not by extending classes.

Exercise: Split a Monolithic Component

Exercise: Lift State Up

Exercise: Compose Complex Components

Key Takeaways

1. Single Responsibility - Each component should have one job
2. Split when needed - Too many props or complex logic means it's time to split
3. Lift state up - Share state through the nearest common ancestor
4. Favor composition - Build complex UIs from simple, composable pieces
5. Keep it testable - Focused components are easier to test