mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? network(
    1. MyNetworkImage value
    )?,
  2. TResult? base64(
    1. MyBase64Image value
    )?,
  3. TResult? filePath(
    1. MyFilePathImage value
    )?,
  4. TResult? asset(
    1. MyAssetImage value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  TResult? Function(MyNetworkImage value)? network,
  TResult? Function(MyBase64Image value)? base64,
  TResult? Function(MyFilePathImage value)? filePath,
  TResult? Function(MyAssetImage value)? asset,
}) {
  final _that = this;
  switch (_that) {
    case MyNetworkImage() when network != null:
      return network(_that);
    case MyBase64Image() when base64 != null:
      return base64(_that);
    case MyFilePathImage() when filePath != null:
      return filePath(_that);
    case MyAssetImage() when asset != null:
      return asset(_that);
    case _:
      return null;
  }
}