Key Takeaways
- Components enable code reuse: build a Button once, use it 500 times with consistent behavior and styling.
- Composition over inheritance: build complex UIs by combining simple components rather than extending base classes.
- Component libraries like shadcn/ui and Radix provide accessible, customizable building blocks that accelerate development.
Component Design Principles
- Single responsibility: Each component does one thing well. A ProductCard displays a product; it does not fetch product data.
- Props for configuration: Pass data and callbacks through props. Components should be configurable, not hard-coded.
- Composition: Build complex components by combining simpler ones. A Form contains FormField components, which contain Input and Label components.
- Separation of concerns: Keep logic (hooks), presentation (JSX), and styling (CSS/Tailwind) organized within the component.
Component Size Rule
If a component exceeds 200 lines or handles more than one responsibility, split it. Small, focused components are easier to test, debug, and reuse.
Frequently Asked Questions
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