when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult initial(),
  2. required TResult unauthenticated(),
  3. required TResult authenticated(
    1. User user
    ),
})

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()  initial,required TResult Function()  unauthenticated,required TResult Function( User user)  authenticated,}) {final _that = this;
switch (_that) {
case _Initial():
return initial();case _Unauthenticated():
return unauthenticated();case _Authenticated():
return authenticated(_that.user);}
}