code: function (key, options) {
            var opts = calcOptions(options)
            var keyName = [opts['prefix'], key].join('')
  
            storage.removeItem(keyName)
          }
docs: @ngdoc method
  @name $sessionStorage#remove
  
  @description
  Remove given sessionStorage entry
  
  @param {string} key Id of the key-value pair to delete.
  @param {Object} options Options object.
  See {@link ngSessionStorage.$sessionStorageProvider#defaults $sessionStorageProvider.defaults}