whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. Element card,
    2. BillingDetails? billingDetails
    )?, {
  2. TResult? id(
    1. String id
    )?,
  3. TResult? token(
    1. CardTokenPaymentMethod card,
    2. BillingDetails? billingDetails
    )?,
})

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(@ElementConverter()  Element card, @JsonKey(name: "billing_details")  BillingDetails? billingDetails)?  $default,{TResult? Function( String id)?  id,TResult? Function( CardTokenPaymentMethod card, @JsonKey(name: "billing_details")  BillingDetails? billingDetails)?  token,}) {final _that = this;
switch (_that) {
case _CardPaymentMethodRef() when id != null:
return id(_that.id);case _CardPaymentMethodDefault() when $default != null:
return $default(_that.card,_that.billingDetails);case _CardPaymentMethodDetailsToken() when token != null:
return token(_that.card,_that.billingDetails);case _:
  return null;

}
}