🔍 Flutter Basics: Stateless vs Stateful Widgets Explained

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🧱 What is a Widget in Flutter?

In Flutter, everything is a widget—from buttons, padding, and text, to entire screens. Widgets describe what the UI should look like and are used to build the app’s user interface.

There are two main types of widgets:

• StatelessWidget

• StatefulWidget

🟦 StatelessWidget

A is immutable. That means once it's built, it cannot change its internal state during its lifetime.

It is used when the part of the user interface you are building does not depend on any dynamic data or user interaction.

✅ Common Use Cases:

• Logos or static images

• Text that doesn't change

• Buttons with fixed behavior

• Static layout elements

🔧 Example:

🟩 StatefulWidget

A is mutable. It can rebuild itself when its internal state changes, thanks to its associated object.

Use this when you need to update the UI dynamically based on events, data, or user input.

✅ Common Use Cases:

• Forms and user inputs

• Switches, sliders, checkboxes

• Data fetched from APIs

• Animations and tabs

• Showing/hiding elements

🔧 Example:

Here, tapping the button triggers , causing the widget to rebuild with the updated value.

💡 Best Practice Tip

Use StatelessWidget by default. Switch to StatefulWidget only when your UI needs to respond to changes. This keeps your code clean, lightweight, and more performant.

📌 Final Thoughts

Whether you're a beginner or brushing up your knowledge, mastering when to use Stateless and Stateful widgets is essential for Flutter development. Understanding this helps you write efficient, readable, and maintainable code.

If you're on a learning journey, keep building, keep breaking things (in a safe environment 😄), and stay consistent.

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