whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<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 variant of when that fallback to returning null

It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult? whenOrNull<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() when $default != null:
      return $default(_that.type, _that.dir, _that.url, _that.rewriteHost,
          _that.insecure, _that.content, _that.headers, _that.statusCode);
    case _:
      return null;
  }
}