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Apple App Development with Swift Certified User Sample Questions:

1. What is the code snippet an example of?

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

2. Which code correctly creates a size 300 rectangular Image View with rounded corners that displays the entire image, regardless of size?

A)

B)

C)

D)

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

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

5. Review the code.
struct ContentView: View {
let fruits = [ " Apple " , " Banana " , " Kiwi " ]
var body: some View {
List(fruits, id: \.self) { fruit in
Text(fruit)
.font(.headline)
.padding()
}
}
}
Which of the following statements is true about the code?

A) The List view is using the fruits array to display the contents as individual rows.
B) The id: \.self in the List view should be rewritten as id: /self
C) The id: \.self in the List view is not necessary and may be omitted.
D) KeyPaths are used here to extract the font and padding properties dynamically.

Solutions: