I have a simple problem but I cannot find an answer to my question.
Is there a way to mix : optional arguments with default value and required named arguments in a flutter function ?
I need something like that but this exemple doesn't works in flutter.
Future<void> getNationalRanking({required String connectedUserId}, [countryCode = "FR"]) async {
// blabla
}
it might be a stupid syntax that I don't know.
Thanks for your help
Named parameters are already optional if you don't make them required and either make them nullable or provide a default value. For example:
Future<void> getNationalRanking({
required String connectedUserId,
String? countryCode,
}) async {
countryCode ??= "FR";
...
}
or:
Future<void> getNationalRanking({
required String connectedUserId,
String countryCode = "FR",
}) async {
...
}
Your example attempts to mix named parameters with optional positional parameters, but using both is not allowed. From the Dart Language Tour:
A function can have any number of required positional parameters. These can be followed either by named parameters or by optional positional parameters (but not both).