function(regions) {
      var defaults = {
        regionClass: this.getOption('regionClass'),
        parentEl: _.partial(_.result, this, 'el')
      };
  
      return this.regionManager.addRegions(regions, defaults);
    }
function(regions) {
      var defaults = {
        regionClass: this.getOption('regionClass'),
        parentEl: _.partial(_.result, this, 'el')
      };
  
      return this.regionManager.addRegions(regions, defaults);
    }
function ( regions ) { var defaults = { regionClass : this . getOption ( 'regionClass' ) , parentEl : _ . partial ( _ . result , this , 'el' ) } ; return this . regionManager . addRegions ( regions , defaults ) ; }
internal method to build regions
internal method to build regions