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Everything Flutter (Part 3) : Write Your First Flutter App (Part 1)

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Introduction
Flutter is Google's mobile SDK for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source. In this codelab, you'll create a simple Flutter app. If you are familiar with object-oriented code and basic programming concepts such as variables, loops, and conditionals, you can complete this codelab. You don't need previous experience with Dart or mobile programming.
What you'll learn in part 1How to write a Flutter app that looks natural on both iOS and Android. Basic structure of a Flutter app. Finding and using packages to extend functionality. Using hot reload for a quicker development cycle. How to implement a stateful widget. How to create an infinite, lazily loaded list.
In part 2 of this codelab, you'll add interactivity, modify the app's theme, and add the ability to navigate to a new page (called a route in Flutter…