whenOrNull<TResult extends Object?> method

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

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

}
}