res

Description:

res

Result class like many other but this one can return void type too, and does not need a "Unit" type
Features #

Prevent app crashes

Usage #
Future<int> functionThatCanThrowError() async {
final n = Random().nextInt(10);

if (n < 5) {
throw RangeError(n);
}

return n;
}

Future<Result<int, String>> functionThatDoesNotThrow() async {
try {
return Result.ok(await functionThatCanThrowError());
} catch (e, s) {
return Result.err(e.toString() + s.toString());
}

// Or shorter
return Result.fromFuture(
functionThatCanThrowError(),
error: (e, s) => 'Out of Range',
);
}

void main() async {
final result = await functionThatDoesNotThrow();

// Or
// final result = Result.fromFuture(
// functionThatCanThrowError(),
// error: (e, s) => '$e $s',
// );

if (result.isError) {
return print('Error');
}

return print(result.value);
}
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