when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult unknown(),
  2. required TResult video(
    1. List<File> files
    ),
  3. required TResult image(
    1. List<File> files
    ),
  4. required TResult vr(
    1. List<File> files
    ),
  5. required TResult audio(
    1. List<File> files
    ),
  6. required TResult html(
    1. List<File> files
    ),
})

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?>({required TResult Function()  unknown,required TResult Function( List<File> files)  video,required TResult Function( List<File> files)  image,required TResult Function( List<File> files)  vr,required TResult Function( List<File> files)  audio,required TResult Function( List<File> files)  html,}) {final _that = this;
switch (_that) {
case Unknown():
return unknown();case Video():
return video(_that.files);case Image():
return image(_that.files);case Model3D():
return vr(_that.files);case Audio():
return audio(_that.files);case Html():
return html(_that.files);}
}