Useful code which uses reduce()? [closed]

Answer 1

I used reduce to concatenate a list of PostgreSQL search vectors with the || operator in sqlalchemy-searchable:

vectors = (self.column_vector(getattr(self.table.c, column_name))
           for column_name in self.indexed_columns)
concatenated = reduce(lambda x, y: x.op('||')(y), vectors)
compiled = concatenated.compile(self.conn)