code: function (callback) {
              var i;
  
              for (i = 0; i < this.data.length; i += 1) {
                  callback.call(this, this.data[i], i);
              }
              return this;
          }
docs: Iterates through all the objects
  
  @public
  @param {Function(Object, Number)} callback
  @return {Com}