maybeWhen<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeWhen<TResult extends Object?>({
  1. TResult file(
    1. File file
    )?,
  2. TResult network(
    1. String url
    )?,
  3. 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( File file)?  file,TResult Function( String url)?  network,required TResult orElse(),}) {final _that = this;
switch (_that) {
case XXFile() when file != null:
return file(_that.file);case XXImage() when network != null:
return network(_that.url);case _:
  return orElse();

}
}