gistfile1.js

      var testObj = {
        _version: '0.1',

        setVersion: function(ver) {
          this._version = ver;
          return this;
        },

        getVersion: function() {
          return this._version;
        },

        adjustVersion: function() {
          var _ver, _obj, _ref;
          
          _ver = this.getVersion().split('.'),
            _obj = new Object({}), 
              _obj.major = typeof(arguments[0]) === "undefined" ? 0 : parseInt(arguments[0], 10),
                _obj.minor = typeof(arguments[1]) === "undefined" ? 0 : parseInt(arguments[1], 10),
                  _obj._major = parseInt(_ver[0], 10),
                    _obj._minor = parseInt(_ver[1], 10);
          
          
          new Array('major', 'minor').each(function(k) {
            var i, _i;
            i = _obj[k], _i = _obj['_' + k + ''];
            
            if (i > 0 || i < 0 && _i >= 0 && (_i + i) >= 0) {
              _i = _i + i;
            } else if ((_i + i) < 0) {
              _i = 0;
            }
            
            _obj['_' + k + ''] = _i;
          });
          
          this.setVersion(''.concat(_obj._major).concat('.').concat(_obj._minor));
          
          delete _obj.major,
            delete _obj.minor,
              delete _obj._major,
                delete _obj._minor;
          
          return this;
        }
      }