<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_searchable(self):
 """A bool value that indicates whether the person has enough data and can be sent as a query to the API."""

        filter_func = lambda field: field.is_searchable
        return bool(filter(filter_func, self.names) or 
                    filter(filter_func, self.emails) or
                    filter(filter_func, self.phones) or
                    filter(filter_func, self.usernames))