when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? number,
    2. int? expirationYear,
    3. int? expirationMonth,
    4. String? cvc,
    )
)

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? number,  int? expirationYear,  int? expirationMonth,  String? cvc)  $default,) {final _that = this;
switch (_that) {
case _CardDetailsConstructor():
return $default(_that.number,_that.expirationYear,_that.expirationMonth,_that.cvc);case _:
  throw StateError('Unexpected subclass');

}
}