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In jsfiddle is possible to use for example jQuery.
But I cannot see any references, for example, to underscore or backbone.js.
If I run this demo I get the error:
Uncaught ReferenceError: _ is not defined
How can I use underscore.js or backbone.js libraries in jsfiddle?
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Adding Underscore to a Node. Once added, underscore can be referred in any of the Node. js modules using the CommonJS syntax: var _ = require('underscore'); Now we can use the object underscore (_) to operate on objects, arrays and functions.
js is a JavaScript library which provides utility functions for common programming tasks. It is comparable to features provided by Prototype. js and the Ruby language, but opts for a functional programming design instead of extending object prototypes. The documentation refers to Underscore.
Underscore ( _ ) is just a plain valid character for variable/function name, it does not bring any additional feature. However, it is a good convention to use underscore to mark variable/function as private. You can check Underscore prefix for property and method names in JavaScript for some previous discussion.
Add the URL for the required library under the "Add Resources" button on the left hand side.
See http://jsfiddle.net/alnitak/BwHxv/
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