anchor.diff:  
     function IR(){}
   
  +  // Public methods
     IR.irImageTag = function(){
       var args = parseArgs.apply(this, arguments),
           url = generateEndpoint(args.source, args.modifiers);
  
positive.code: }(this, function(root){
    'use strict';
  
    function parseArgs(){
      var source, modifiers;
      source = typeof arguments[0] === 'string' ? arguments[0] : null;
  
negative.code:   IR.<%= Image::Resizer::Rails.js_url %> = IR.irUrl;
    <% end %>
  
    return IR;
  }));
  