asdf.js

    def.$add_observer = function(observer, func) {
var $arity = arguments.length;if ($arity < 1) { $opal.ac($arity, -2, this, "add_observer"); }
        var self = this, $a, $b;
      if (self.observer_peers == null) self.observer_peers = nil;
if (func == null) {
        func = "update"
      }
      if (($a = (
            (
              (
                console.log([
                  'IVAR',
                  ("observer_peers" || 'UNDEF'),
                  self.hasOwnProperty("observer_peers"),
                  self["observer_peers"]
                ].$inspect()),
                $b = self["observer_peers"],
                (self.hasOwnProperty("observer_peers") && $b != null) ||
                (!self.hasOwnProperty("observer_peers") && $b !== nil)
              )
            ) ? 'instance-variable' : nil
          )) === false || $a === nil) {
        self.observer_peers = $hash2([], {})
      };
      if (($a = observer['$respond_to?'](func)) === false || $a === nil) {
        self.$raise((($a = $scope.NoMethodError) == null ? $opal.cm("NoMethodError") : $a), "observer does not respond to `" + (func.$to_s()) + "'")
      };
      return self.observer_peers['$[]='](observer, func);
    };