code: function omit(obj, blackList) {
    var newObj = {};
    Object.keys(obj || {}).forEach(function (key) {
      if (blackList.indexOf(key) === -1) {
        newObj[key] = obj[key];
      }
    });
    return newObj;
  }
docs: Return a copy of the object, filtered to omit the blacklisted array of keys.