transpose method
Transposes a Result
with a nullable value into a nullable Result
.
Ok(null)
will be mapped to null
.
Ok(v)
and Err(e)
(if v
and e
are not null) will be returned as is.
Implementation
Result<T, E>? transpose() {
if (isOk) {
final x = unwrap();
return x != null ? Ok(x) : null;
} else {
return Err(unwrapErr());
}
}