Grant Create Function or Procedure in SQL DB for a user/role

1) Grant permission for a user/role to create function in DB
 
GRANT CREATE FUNCTION TO [user/role]]
    GO


2) Grant select and DRI(Declarative Referential Integrity) permission on a user define function in sql.

GRANT  SELECT, REFERENCES  ON [dbo].[func name]  TO [user/role]
    GO

Note:-DRI permission is required when function written type is data table