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

2. Review the code snippet.

What is the output from each print statement?

3. What is the code snippet an example of?

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

4. Which two statements about building an app are true? (Choose 2.)

A) You can preview a View in the Canvas without running your app.
B) You can run your app in the simulator with Generic iOS Device chosen.
C) You need a paid Apple Developer account in order to run your app on your phone.
D) Your phone must always be physically attached to your Mac to run your apps from Xcode on it.
E) You can run an app on your phone and get debug information in Xcode.

5. You have created a view which includes some formatted text:

You decide to extract this formatted text into a subview so that you can reuse the formatting for other texts.
You highlight the Text and choose Extract subview.
You refactor ExtractedView to BigGreenTextView.
You add the line let text: String to the extracted view above the body.
You replace " That ' s all folks " with a reference to text
How should you call this extracted View from the original View?

A) BigGreenTextView(text)
B) BigGreenTextView(text: text)
C) BigGreenTextView(text: " That ' s all folks " )
D) BigGreenTextView( " That ' s all folks " )

Solutions: