mapOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>(TResult? $default(_Namespace 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( _Namespace value)?  $default,){
final _that = this;
switch (_that) {
case _Namespace() when $default != null:
return $default(_that);case _:
  return null;

}
}