whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? applePay(
    1. List<ApplePayCartSummaryItem> summaryItems,
    2. List<ApplePayShippingMethod> shippingMethods,
    3. List<ApplePaySheetError>? errors
    )?,
})

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( List<ApplePayCartSummaryItem> summaryItems,  List<ApplePayShippingMethod> shippingMethods,  List<ApplePaySheetError>? errors)?  applePay,}) {final _that = this;
switch (_that) {
case _PlatformPaySheetUpdateParams() when applePay != null:
return applePay(_that.summaryItems,_that.shippingMethods,_that.errors);case _:
  return null;

}
}