combine3<T1 extends Object, T2 extends Object, T3 extends Object> static method
Combines 3 Result outcomes into 1 containing a tuple of their values if all are Ok.
If any are Err, applies onErr
function to combine errors.
See also: combineResult.
Implementation
static Result<(T1, T2, T3)>
combine3<T1 extends Object, T2 extends Object, T3 extends Object>(
Result<T1> r1,
Result<T2> r2,
Result<T3> r3, [
@noFutures
Err<(T1, T2, T3)> Function(Result<T1>, Result<T2>, Result<T3>)? onErr,
]) {
final combined = combineResult<Object>(
[r1, r2, r3],
onErr: onErr == null
? null
: (l) => onErr(
l[0].transf<T1>(),
l[1].transf<T2>(),
l[2].transf<T3>(),
).transfErr(),
);
return combined.map((l) => (l[0] as T1, l[1] as T2, l[2] as T3));
}