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Apple App Development with Swift Certified User Sample Questions:

1. Review the code.
var capitalCities = [ " USA " : " Washington D.C. " , " Spain " : " Madrid " , " Peru " : " Lima " ] Which two statements add the capital city of " Italy " to the dictionary? (Choose 2.)

A) capitalCities[ " Rome " ] = " Italy "
B) capitalCities.updateValue( " Rome " , forKey: " Italy " )
C) capitalCities[ " Italy " ] = " Rome "
D) capitalCities.append([ " Italy " : " Rome " ])
E) capitalCities = capitalCities + [ " Italy " : " Rome " ]

2. 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 used to indicate to the reader that the parameter is being referenced.
D) self is always needed when you are setting properties in an initializer.

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

4. What is the code snippet an example of?

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

5. Which property wrapper allows you to read data from the system or device settings?

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

Solutions: