Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Enumerations and Optionals in Swift Objects and Optionals Optional Chaining

Posted by kelake
kelake
4,223 Points

why check all values?

I don't understand why he is checking all the values when all Pasan says he is interested in is the building number? Changing their values to nil does not change the outcome. Why not just check to see if their is a building number only?

1 Answer

Everton Carneiro
Everton Carneiro
15,994 Points
Everton Carneiro
Everton Carneiro
15,994 Points

Because all the values are optionals, so you need to unwrap all of them before get the number casted to Int.