import ballerina/io;
function demo(string s) returns int|error {
// Named workers have a return type, which defaults to nil
// if not specified.
worker A returns int|error {
// A return statement in a named worker terminates
// the worker, not the function.
// Similarly, when `check` is used and the expression evaluates
// to an error, the error value is returned terminating only the worker.
int x = check int:fromString(s);
return x + 1;
}
io:println("In function worker");
// Waiting on a named worker will give its return value.
int y = check wait A;
return y + 1;
}
public function main() returns error? {
int res = check demo("50");
io:println(res);
res = check demo("50m");
io:println(res);
}
Named Worker Return ValuesNamed workers have a return type, which defaults to nil.
A return statement in a named worker terminates
the worker, not the function.
Similarly, when |
import ballerina/io;
function demo(string s) returns int|error {
worker A returns int|error {
Named workers have a return type, which defaults to nil if not specified.
int x = check int:fromString(s);
return x + 1;
A return statement in a named worker terminates
the worker, not the function.
Similarly, when check is used and the expression evaluates
to an error, the error value is returned terminating only the worker.
}
io:println("In function worker");
int y = check wait A;
Waiting on a named worker will give its return value.
return y + 1;
}
public function main() returns error? {
int res = check demo("50");
io:println(res);
res = check demo("50m");
io:println(res);
}
bal run named_worker_return_values.bal
In function worker
52
In function worker
error: {ballerina/lang.int}NumberParsingError {"message":"'string' value '50m' cannot be converted to 'int'"}
