when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(String? returnUrl, String? cancelUrl, String? brandName, String? locale, String? landingPage, PPShippingPreference? shippingPreference, PPUserAction? userAction,))

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?>(
  TResult Function(
          String? returnUrl,
          String? cancelUrl,
          String? brandName,
          String? locale,
          String? landingPage,
          PPShippingPreference? shippingPreference,
          PPUserAction? userAction)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PPOrderAppContext():
      return $default(
          _that.returnUrl,
          _that.cancelUrl,
          _that.brandName,
          _that.locale,
          _that.landingPage,
          _that.shippingPreference,
          _that.userAction);
    case _:
      throw StateError('Unexpected subclass');
  }
}