Welcome to the Dart API reference documentation, covering the official Dart API libraries. Some of the most fundamental Dart libraries include:

• dart:core: Core functionality such as strings, numbers, collections, errors, dates, and URIs.
• dart:html: DOM manipulation for web apps.
• dart:io: I/O for command-line apps.

Except for dart:core, you must import a library before you can use it. Here's an example of importing dart:html, dart:math, and a third popular library called polymer.dart:

import 'dart:html';
import 'dart:math';
import 'package:polymer/polymer.dart';

Polymer.dart is an example of a library that isn't included in the Dart download, but is easy to get and update using the pub package manager. For information on finding, using, and publishing libraries (and more) with pub, see pub.dartlang.org.

The main site for learning and using Dart is www.dartlang.org. Check out these pages:

• Dart homepage
• Tutorials
• Programmer's Guide
• Samples
• A Tour of the Dart Libraries

This API reference is automatically generated from the source code in the Dart project. If you'd like to contribute to this documentation, see Contributing and Writing API Documentation.