when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? type,
    2. String? dir,
    3. String? url,
    4. bool? rewriteHost,
    5. bool? insecure,
    6. String? content,
    7. Map<String, String>? headers,
    8. int? statusCode,
    )
)

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? type,
          String? dir,
          String? url,
          bool? rewriteHost,
          bool? insecure,
          String? content,
          Map<String, String>? headers,
          int? statusCode)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _Masquerade():
      return $default(_that.type, _that.dir, _that.url, _that.rewriteHost,
          _that.insecure, _that.content, _that.headers, _that.statusCode);
    case _:
      throw StateError('Unexpected subclass');
  }
}