maybeWhen<TResult extends Object?> method

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({ TResult success(String title, String message)?, TResult failure(String title, String message)?, TResult info(String title, String message)?, TResult warning(String title, String message)?, required TResult orElse(), })

A variant of when that fallback to an orElse callback.

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return orElse();
}

Implementation

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String title,  String message)?  success,TResult Function( String title,  String message)?  failure,TResult Function( String title,  String message)?  info,TResult Function( String title,  String message)?  warning,required TResult orElse(),}) {final _that = this;
switch (_that) {
case _Success() when success != null:
return success(_that.title,_that.message);case _Failure() when failure != null:
return failure(_that.title,_that.message);case _Info() when info != null:
return info(_that.title,_that.message);case _Warning() when warning != null:
return warning(_that.title,_that.message);case _:
  return orElse();

}
}