A DART file is a source code file that contains Dart programming language . It is used for building web, server, and mobile applications and IoT devices. Dart programming language an object-oriented language with C-style syntax that supports mixins, abstract classes, optional typing, and interfaces.
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Extension methods are new as of Dart 2.7. They allow you to add functionality to existing libraries and classes . For example, you can add extra functionality to the Dart core String library, that are only available in your app.
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