when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. TokenType type,
    2. String? name,
    3. Address? address
    ), {
  2. required TResult card(
    1. CardTokenParams params
    ),
  3. required TResult bankAccount(
    1. BankAccountTokenParams params
    ),
  4. required TResult pii(
    1. PIITokenParams params
    ),
})

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( TokenType type,  String? name,  Address? address)  $default,{required TResult Function( CardTokenParams params)  card,required TResult Function( BankAccountTokenParams params)  bankAccount,required TResult Function( PIITokenParams params)  pii,}) {final _that = this;
switch (_that) {
case _CreateTokenParamsLegacy():
return $default(_that.type,_that.name,_that.address);case _CreateTokenParamsCard():
return card(_that.params);case _CreateTokenParamsBankAccount():
return bankAccount(_that.params);case _CreateTokenParamsPII():
return pii(_that.params);case _:
  throw StateError('Unexpected subclass');

}
}