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;

}
}