whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String? password, @JsonKey.new(name: 'ascii') String? ascii, String? customTable, @JsonKey.new(name: 'custom_table') String? legacyCustomTable, List<String>? customTables, @JsonKey.new(name: 'custom_tables') List<String>? legacyCustomSets, int? paddingMin, @JsonKey.new(name: 'padding_min') int? legacyPaddingMin, int? paddingMax, @JsonKey.new(name: 'padding_max') int? legacyPaddingMax,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( String? password, @JsonKey(name: 'ascii')  String? ascii,  String? customTable, @JsonKey(name: 'custom_table')  String? legacyCustomTable,  List<String>? customTables, @JsonKey(name: 'custom_tables')  List<String>? legacyCustomSets,  int? paddingMin, @JsonKey(name: 'padding_min')  int? legacyPaddingMin,  int? paddingMax, @JsonKey(name: 'padding_max')  int? legacyPaddingMax)?  $default,) {final _that = this;
switch (_that) {
case _Sudoku() when $default != null:
return $default(_that.password,_that.ascii,_that.customTable,_that.legacyCustomTable,_that.customTables,_that.legacyCustomSets,_that.paddingMin,_that.legacyPaddingMin,_that.paddingMax,_that.legacyPaddingMax);case _:
  return null;

}
}