whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String id, String name, bool required, CollectDataFieldType fieldType,)?)

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 id,  String name,  bool required,  CollectDataFieldType fieldType)?  $default,) {final _that = this;
switch (_that) {
case _CollectDataField() when $default != null:
return $default(_that.id,_that.name,_that.required,_that.fieldType);case _:
  return null;

}
}