<html><head></head><body dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="ApplePlainTextBody"><div class="ApplePlainTextBody"><blockquote type="cite">On Sep 25, 2016, at 4:19 PM, Trans via swift-evolution <swift-evolution@swift.org> wrote:<br><br>Basically "john.residence.numberOfRooms" is a completely wasted<br>expression -- it's meaningless.<br></blockquote><br>Not true; it's an attempt to access the `numberOfRooms` property on `Optional<Residence>`. That property doesn't exist, but it could be added using an extension.<br><br>(And `Optional` does have several members—most notably `map`, `flatMap`, and `unsafelyUnwrapped`.)<br><br>-- <br>Brent Royal-Gordon<br>Architechies<br><br></div></body></html>