| Welcome to the [Dart](https://dart.dev/) API reference documentation, covering |
| the [Dart core libraries](https://dart.dev/guides/libraries). These include: |
| |
| * [dart:core](dart-core/dart-core-library.html): Core functionality such as |
| strings, numbers, collections, errors, dates, and URIs. |
| * [dart:html](dart-html/dart-html-library.html): DOM manipulation for web apps |
| (available only to web apps). |
| * [dart:io](dart-io/dart-io-library.html): I/O for non-web apps. |
| |
| Except for `dart:core`, you must import a library before you can use it. Here's |
| an example of importing `dart:async` and `dart:math`: |
| |
| ```dart |
| import 'dart:async'; |
| import 'dart:math'; |
| ``` |
| |
| You can find more libraries using the [pub.dev site](https://pub.dev). |
| |
| The main site for learning and using Dart is |
| [dart.dev](https://dart.dev). Check out these pages: |
| |
| * [Platforms](https://dart.dev/platforms) |
| * [Language tour](https://dart.dev/guides/language/language-tour) |
| * [Library tour](https://dart.dev/guides/libraries/library-tour) |
| * [Sample code](https://dart.dev/samples) |
| |
| This API reference is automatically generated from source code in the [Dart |
| SDK project](https://github.com/dart-lang/sdk). |
| If you'd like to give feedback or edit this documentation, see |
| [Contributing](https://github.com/dart-lang/sdk/wiki/Contributing). |
