Underscore is a utility-belt library for JavaScript that provides functional programming support.
http://documentcloud.github.com/underscore/
JavaScript Libraries and Functions
Get access to data on 16,320,065 websites Underscore.js Customers. We know of 7,208,363 live websites using Underscore.js and an additional 9,111,702 sites that used Underscore.js historically and 1,069,518 websites in the United States.
Get a list of 16,320,065 websites using Underscore.js which includes location information, hosting data, contact details, 7,208,363 currently live websites and an additional 1,518,244 domains that redirect to sites in this list. 9,111,702 sites that used this technology previouslyand 1,069,518 websites in the United States currently using Underscore.js.
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