when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String clientId,
    2. String returnUrl,
    3. PPEnvironment environment,
    4. PPCurrencyCode? currencyCode,
    5. 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 clientId,
          String returnUrl,
          PPEnvironment environment,
          PPCurrencyCode? currencyCode,
          PPUserAction? userAction)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PPCheckoutConfig():
      return $default(_that.clientId, _that.returnUrl, _that.environment,
          _that.currencyCode, _that.userAction);
    case _:
      throw StateError('Unexpected subclass');
  }
}