First look: Facebook's open source React library

Recently released as an open source library, React enables developers to assemble a modern JavaScript UI fast, once you climb the learning curve

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The front end of a modern application is as important as its back end. Under the hood, your application may be beautiful, but if users hate the UI, you lose.

That’s where JavaScript user interface libraries and frameworks come into play. Some, like JQuery, have been around a while -- and have grown to be large, complex chunks of code. Newer libraries and frameworks tend to focus on modern Web application methodologies, including single-page applications.

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