maybeWhen<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeWhen<TResult extends Object?>({
  1. TResult done()?,
  2. TResult error(
    1. String error
    )?,
  3. TResult progress()?,
  4. 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()?  done,TResult Function( String error)?  error,TResult Function()?  progress,required TResult orElse(),}) {final _that = this;
switch (_that) {
case PickerLoadStatusDone() when done != null:
return done();case PickerLoadStatusError() when error != null:
return error(_that.error);case PickerLoadStatusProgress() when progress != null:
return progress();case _:
  return orElse();

}
}