What is builder in flutter?

A builder is a Flutter design pattern in which the construction code of a widget is defined outside of its class . Builder functions are callback interfaces that pass data (often layout-specific) to the parent widget which returns a child based on that data.

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What is stateless widget flutter?

According to Flutter’s official website, which is the very first resource for learning about anything Flutter, ” a Stateless widget is a widget that describes part of the user interface by building a constellation of other widgets that describe the user interface more concretely “.

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