From GPWiki
Prototype is a JavaScript Framework to aid development of web-based applications using JavaScript and AJAX.
Prototype:
- Simplifies browser differences, such as document.all and document.getElementById so that the programmer can worry less about browser quirks as well as reduce the amount of debugging needed
- Provides extensions to the basic variable types in JavaScript to add enhanced functionality, such as String.escapeHTML ()
- Adds cross-browser AJAX functions to make sending and receiving AJAX calls easy, including timed calls and automatic populating of content
- Reduces the amount the programmer has to type with the well designed API. For example, using $() instead of document.getElementById()
- Forms the basis of other JavaScript libraries and functions, such as Scriptaculous
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