Component Patterns

As your app grows, you need strategies to keep your components clean and reusable. Here are the most common patterns in React.

1. Lifting State Up 🏋️‍♀️

Problem: Two sibling components need to share the same data. Solution: Move the state up to their closest common parent.

2. Composition (The children Prop) 🧩

Instead of Inheritance (like classes), React uses Composition. You can pass components inside other components using the special children prop.

3. Controlled Components 🎮

In HTML, <input> elements manage their own state. In React, we want React to control the state. This is called a Controlled Component.

Why? It gives you full control over the input data (validation, formatting, etc.).

4. Container vs. Presentational Components 📦

• Presentational (Dumb): Just renders UI based on props. No logic.
• Container (Smart): Handles logic, fetching data, and state. Passes data to Presentational components.

(Note: With Hooks, we often mix these, but it is still a good mental model for organization.)

Quiz

Key Takeaways

✅ Lift State Up to share data.
✅ Composition (children) makes layouts flexible.
✅ Controlled Components give you full control over forms.
✅ Separation of Concerns keeps code clean.

What's Next?

We have learned the theory. Now let's build something real. Next up: Building React Apps (Setting up a project with Vite).

Keep coding! 🚀