The easiest way to try out Dart is to use Dartboard, a way to execute Dart code interactively in any modern browser. Dartboard is embedded in the Dart site, at www.dartlang.org. You can also use Dartboard by going directly to try.dartlang.org. Here’s a picture of what you’ll see on that site:

Change the code as you like, and then click the Run button (at the upper left). You’ll see the results of your code in a new area below:

The URL at the upper right of the Dartboard is a link to the code you just ran.

Like most things related to Dart, Dartboard is still changing. For the latest information, see the Dartboard tutorial.