# Provider Pattern (Flutter)

> Provider, ChangeNotifier, Consumer, Selector, MultiProvider, ProxyProvider

- 18 interview questions
- Mid-Level
- [Interview Questions: Flutter](https://sharpskill.dev/en/technologies/flutter/interview-questions.md)

## 1. What is the main role of the Provider package in Flutter?

**Answer**

Provider is a wrapper around InheritedWidget that simplifies state management in Flutter. It allows propagating data through the widget tree efficiently without manually passing data through each widget. Provider automatically handles the rebuild of widgets that depend on modified data.

## 2. Which class must be extended to create a reactive data model with Provider?

**Answer**

ChangeNotifier is the base class for creating reactive data models with Provider. It provides the notifyListeners() method that notifies all subscribed widgets when data changes. Widgets listening to this ChangeNotifier will be automatically rebuilt.

## 3. How to access a Provider instance from a child widget?

**Answer**

Provider.of<T>(context) allows accessing the Provider instance of type T from any descendant widget. By default, this method creates a dependency that triggers widget rebuild on changes. This is the most direct method to access Provider data.

## 15 more questions available

- What is the difference between context.read<T>() and context.watch<T>()?
- Which Provider widget should be used to expose multiple Providers to the widget tree?

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## Other Flutter interview topics

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