How do you save a DartPad?

From documentation: “DartPad supports dart:* libraries that work with web apps; it doesn’t support dart:io or libraries from packages. If you want to use dart:io, use the Dart SDK instead. If you want to use a package, get the SDK for a platform that the package supports.”

Dart is a programming language designed for client development, such as for the web and mobile apps . It is developed by Google and can also be used to build server and desktop applications. Dart is an object-oriented, class-based, garbage-collected language with C-style syntax.

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