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Apple App Development with Swift Certified User Sample Questions:

1. 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 used to indicate to the reader that the parameter is being referenced.
C) self is always needed when you are setting properties in an initializer.
D) self is needed to distinguish between the property and the parameter with the same name.

2. 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 is not necessary and may be omitted.
C) KeyPaths are used here to extract the font and padding properties dynamically.
D) The id: \.self in the List view should be rewritten as id: /self

3. 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.koys())
C) let emojis = Array(faces.keys)
D) let emojis List(faces.values())

4. Review the code snippet.

The code snippet does not compile.
Which two actions will fix the errors? (Choose 2.)

A) Change the initial value of totalCost from o to 0.0.
B) Change shipping from let to var to make it mutable.
C) Change the type of quantity from int to Double .
D) Change totalCost from let to var to make it mutable.
E) Chang the type of unitPrice from Double to Int.

5. If View A calls View B, which Swift Property Wrapper would you use in View B in order to return the value of a state to View A?

A) @State
B) @Environment
C) @Observable
D) @Binding

Solutions: