Differences between StatelessWidget and StatefulWidget in Flutter: Which One to Use?

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The fundamental difference between a Stateless widget and a Stateful widget in Flutter lies in their ability to handle and reflect changes in data.

Let’s delve into the key differences:

  1. StatelessWidget:
    • A Stateless widget is immutable, which means that once it is built and displayed on the user interface, it cannot change its content or appearance.
    • It has no internal state that can change after being built.
    • It is ideal for representing static elements of the user interface, such as text labels, icons, or images that do not change based on user interaction or received data.
  2. StatefulWidget:
    • A Stateful widget has mutable internal state that can change after its initial construction.
    • It can react to events and changes in data.
    • It uses a separate class called State to handle its state and associated logic.
    • The setState() function is used to notify Flutter that changes in the state have occurred and the widget needs to be rebuilt. This triggers a new call to the widget’s build() method.

In summary, if a part of your user interface never changes after being built (such as a static icon), you can use a Stateless widget. However, if you need a part of the user interface to react and change based on events or data (such as updating a counter or displaying real-time information), then you need a Stateful widget.

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