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Apple App Development with Swift Certified User Sample Questions:

1. Review the code snippet.

Which statement completes the code snippet so that:
* The lastReleaseDate remains the same when nextApplePhone.releaseDate is nil.
* The lastReleaseDate updates to the nextApplePhone.releaseDate when nextApplePhone.releaseDate is NOT nil.

A) nextApplePhone.releaseDate! : lastReleaseDate
B) lastReleaseDate : nextApplcPhone.rcleaseDate!
C) nextApplePhone.releaseDate : lastReleaseDate
D) lastReleaseDate : nextApplePhone.releaseDate

2. What is the code snippet an example of?

A) Implicitly unwrapped optional
B) Optional binding
C) Optional chaining
D) Force unwrapping

3. Review the code.
Note: You might need to scroll to see the entire block of code.

A breakpoint is set on line 3. When the application is run. it will stop at line 3. You need to debug the code.
Drag each debugging control from the left to the correct instruction on the right. You will receive partial credit for each correct answer

4. Complete the code that will add the BlueView to the NavigationStack and present the RedView modally.

|Complete the code by typing in the boxes.

5. Review the code snippet.

The " faces " dictionary contains emojis and their descriptions.
Which code will create an array named " emo)is " that will copy all the emojis from the " faces " dictionary?

A) let emojis List(faces.values())
B) let emojis - List(faces.koys())
C) let emojis = Array(faces.keys)
D) let emojis - Array(faces.values)

Solutions: