when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String hadith,
    2. String rawi,
    3. String mohdith,
    4. String book,
    5. String numberOrPage,
    6. String grade,
    7. String? takhrij,
    8. bool hasSharhMetadata,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( String hadith,  String rawi,  String mohdith,  String book,  String numberOrPage,  String grade,  String? takhrij,  bool hasSharhMetadata)  $default,) {final _that = this;
switch (_that) {
case _ExplainedHadith():
return $default(_that.hadith,_that.rawi,_that.mohdith,_that.book,_that.numberOrPage,_that.grade,_that.takhrij,_that.hasSharhMetadata);case _:
  throw StateError('Unexpected subclass');

}
}