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# Welcome!
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Welcome to the Dart API reference documentation, covering the
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[Dart core libraries](https://dart.dev/guides/libraries). These include:
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* [dart:core](dart-core/dart-core-library.html): Core functionality such as
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strings, numbers, collections, errors, dates, and URIs.
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* [dart:io](dart-io/dart-io-library.html): I/O for non-web apps.
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* [dart:html](dart-html/dart-html-library.html): DOM manipulation for web apps
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(available only to web apps).
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The core libraries - except for `dart:core` - must be imported before they're
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available for use:
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```dart
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import 'dart:math';
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```
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Additionally, you can find Dart packages at [pub.dev](https://pub.dev).
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## Language docs
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The main site for learning and using Dart is [dart.dev](https://dart.dev).
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Check out these pages:
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* [Dart overview](https://dart.dev/overview)
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* [Dart language documentation](https://dart.dev/language)
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* [Library tour](https://dart.dev/guides/libraries/library-tour)
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* [Tutorials](https://dart.dev/tutorials)
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This API reference is generated from the SDK source at
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[dart-lang/sdk](https://github.com/dart-lang/sdk). If you'd like to give
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feedback on or edit this documentation, see
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[Contributing](https://github.com/dart-lang/sdk/blob/main/CONTRIBUTING.md).
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