Use the short syntax to unwrap optional properties

[ofirmiron]

Because we're reusing the property names, we can use the shorter form as described in The Basics.

[amartini51]

Edited the PR's title to avoid confusion with implicitly unwrapped optionals.

[amartini51]

Thanks for the PR! This change looks good to me. I confirmed that this is the only code listing in the chapter that could switch over to the newer short syntax.

Do you mind editing the commit message? Or is it ok if I edit it for you? I'd like to remove the mention of "implicit" like I did in this PR's title, to avoid confusion with IUOs. For example:

Use the short syntax to unwrap optional properties.

Because we're reusing the property names, we can use the shorter form as
described in The Basics.

[ofirmiron]

Thanks, done!

[amartini51]

Thanks, done!

Not sure what happened, but your edited commit didn't show up. I still saw 8456acc

Since you're ok with the change, I amended the commit to edit its message, and force pushed it here.