maybeWhen<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeWhen<TResult extends Object?>({
  1. TResult immediate(
    1. String label,
    2. String amount,
    3. bool? isPending
    )?,
  2. TResult deferred(
    1. String label,
    2. String amount,
    3. int deferredDate
    )?,
  3. TResult recurring(
    1. String label,
    2. String amount,
    3. ApplePayIntervalUnit intervalUnit,
    4. int intervalCount,
    5. int? startDate,
    6. int? endDate,
    )?,
  4. required TResult orElse(),
})

A variant of when that fallback to an orElse callback.

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return orElse();
}

Implementation

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String label,  String amount,  bool? isPending)?  immediate,TResult Function( String label,  String amount,  int deferredDate)?  deferred,TResult Function( String label,  String amount,  ApplePayIntervalUnit intervalUnit,  int intervalCount,  int? startDate,  int? endDate)?  recurring,required TResult orElse(),}) {final _that = this;
switch (_that) {
case ImmediateCartSummaryItem() when immediate != null:
return immediate(_that.label,_that.amount,_that.isPending);case DeferredSummaryItem() when deferred != null:
return deferred(_that.label,_that.amount,_that.deferredDate);case RecurringCartSummaryItem() when recurring != null:
return recurring(_that.label,_that.amount,_that.intervalUnit,_that.intervalCount,_that.startDate,_that.endDate);case _:
  return orElse();

}
}