DbConnection or IO(DbConnection) about mostly-adequate-guide HOT 2 CLOSED

// dbUrl :: Config -> Either(Error, url)
var dbUrl = function(c) {
  return (c.uname && c.pass && c.host && c.db)
    ? Right.of("db:pg://"+c.uname+":"+c.pass+"@"+c.host+"5432/"+c.db)
    : Left.of(Error("Invalid config!"));
}

//  connectDb :: Config -> Either(Error, DbConnection)
var connectDb = compose(map(Postgres.connect), dbUrl);