whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(MiniProgramFallbackStrategy strategy, String? route, String? message)?)

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( MiniProgramFallbackStrategy strategy,  String? route,  String? message)?  $default,) {final _that = this;
switch (_that) {
case _MiniProgramFallback() when $default != null:
return $default(_that.strategy,_that.route,_that.message);case _:
  return null;

}
}