title: angular.js - best practice for defining a utility library
body: <p>I'm giving my first steps with angular, and I need to define a utility helper library, with a couple of function methods, something like</p>
  
  <p><code>dataHelper.parse</code>, <code>dataHelper.sanitize</code>, etc</p>
  
  <p>What would be the recommended way to organize it in angular?</p>