code: function applyFilter (tweenable, filterName) {
        var filters = Tweenable.prototype.filter;
        var args = tweenable._filterArgs;
  
        each(filters, function (name) {
          if (typeof filters[name][filterName] !== 'undefined') {
            filters[name][filterName].apply(tweenable, args);
          }
        });
      }
docs: /*!
  Applies a filter to Tweenable instance.
  @param {Tweenable} tweenable The `Tweenable` instance to call the filter
  upon.
  @param {String} filterName The name of the filter to apply.