code: function objectKeys(object) {
    if (Object.keys) {
      return Object.keys(object);
    }
    var result = [];
  
    angular.forEach(object, function(val, key) {
      result.push(key);
    });
    return result;
  }
docs: IE8-safe wrapper for `Object.keys()`.
  
  @param {Object} object A JavaScript object.
  @return {Array} Returns the keys of the object as an array.