when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>({ required TResult android(), required TResult ios(), required TResult macos(), required TResult web(), required TResult linux(), required TResult windows(), required TResult fuchsia(), })

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() android,
  required TResult Function() ios,
  required TResult Function() macos,
  required TResult Function() web,
  required TResult Function() linux,
  required TResult Function() windows,
  required TResult Function() fuchsia,
}) {
  final _that = this;
  switch (_that) {
    case AndroidPlatform():
      return android();
    case IosPlatform():
      return ios();
    case MacosPlatform():
      return macos();
    case WebPlatform():
      return web();
    case LinuxPlatform():
      return linux();
    case WindowsPlatform():
      return windows();
    case FuchsiaPlatform():
      return fuchsia();
  }
}