when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult applePay(
    1. String orderTypeIdentifier,
    2. String orderIdentifier,
    3. String webServiceUrl,
    4. String authenticationToken,
    ),
})

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?>({required TResult Function( String orderTypeIdentifier,  String orderIdentifier,  String webServiceUrl,  String authenticationToken)  applePay,}) {final _that = this;
switch (_that) {
case _PlatformPayOrderDetails():
return applePay(_that.orderTypeIdentifier,_that.orderIdentifier,_that.webServiceUrl,_that.authenticationToken);case _:
  throw StateError('Unexpected subclass');

}
}