How do you pass data to a custom widget in Flutter?

Using a callback function
Using a global variable
Using constructor parameters
Using the 'setData()' method

Data can be passed to a custom widget in Flutter through constructor parameters. By defining parameters in the widget's constructor, developers can initialize the widget with specific data when creating an instance of it. This promotes encapsulation and allows the customization of each instance of the widget. Understanding how to pass data through constructors is fundamental for building flexible and reusable custom widgets in Flutter.

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