Singleton wrapper around $.Callbacks to emulate Backbone events

Events.js

var Event = (function( $ ) {

    var cache = {},
        slice = [].slice,
        fake = {
            remove: $.noop,
            fireWith: $.noop
        };

    function get( ev, createIfNeeded ) {
        return cache[ ev ] || createIfNeeded ? ( cache[ ev ] = $.Callbacks( "stopOnFalse" ) ) : fake;
    }

    return {
      bind : function( ev, callback, context ) {
          get( ev, true ).add( $.proxy( callback, context ) );
      },
      unbind : function( ev, callback ) {
          get( ev ).remove( callback );
      },
      trigger : function( ev ) {
          get( ev ).fireWith( null, slice.call( arguments, 1 ) );
      }
    };

})( jQuery );