Google today released a new tool that will make learning and testing code for Google's Javascript APIs a lot easier. Google's interactive AJAX API Playground gives developers an easy to use interface to write some basic Javascript code for Google's eight Javascript APIs (Maps, Search, Feeds, Calendar, Visualization, Language, Blogger, Libraries, and Earth).
The API Playground will also become Google's official way to show Javascript samples.
You can currently try out and manipulate over 170 code samples in the Playground, ranging from simple tables, to motion charts based on Google spreadsheets, slideshows based on Media RSS feeds, and various ways of manipulating KML files for Google Earth.

The Playground runs on top of Google's App Engine, which is quickly becoming Google's preferred way of developing and releasing new products.
Ben Lisbakken, a Developer Programs engineer at Google, developed the API Playground as a "20% project." Google also made the source code for the API Playground available under the Apache 2.0 license.
For students (or anybody who is trying to get his/her head around the basic concepts of using Google's APIs), this could be a great way to get some coding experience with almost immediate feedback and without having to learn the complexities of an IDE.
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Very cool!
Nice to have a playground! We are right in the middle of an integration with Google Docs and it would have been nice to have a playground to cut our teeth on. Very cool for developers to start creating some nice apps!
@troymalone
Pelotonics
This is a really nice low effort way to get some introductory action to APIs you'd otherwise not know about or deal with
Another cool way to play with APIs is zembly.com. They even have code completion for REST APIs which makes exploration much easier. Give it a shot!
What is more interesting is that the playground was developed in the famous ‘twenty-percent-time’. It’s the same product development philosophy that originated Google Reader, Gmail, and AdSense.
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Definitely looks useful for testing/learning their AJAX APIs. good find