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Apple App Development with Swift Certified User Sample Questions:

1. Select the area in Xcode that allows you to display the Preview Canvas.

2. Review the code snippet and identify what happens when the program is executed.

A) Only menu items including " Pizza " . " Burger " , " Chicken " . " Pasta " . " Salad " are printed.
B) Only menu items including " Burger " . " Chicken " . " Pasta " . " SaJad " . " Steak " are printed.
C) Only menu items including " Burger " . " Chicken " . " Pasta " . " Salad " are printed.
D) The for loop prints all the menu items in the array.

3. Why does the initializer for the following struct need the keyword self?

A) self is only needed when the property does not have a default value.
B) self is needed to distinguish between the property and the parameter with the same name.
C) self is always needed when you are setting properties in an initializer.
D) self is used to indicate to the reader that the parameter is being referenced.

4. What is the code snippet an example of?

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

5. 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) lastReleaseDate : nextApplePhone.releaseDate
D) nextApplePhone.releaseDate! : lastReleaseDate

Solutions: