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Apple App-Development-with-Swift-Certified-User Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: App Logic and Data Handling | - Data management in apps
|
| Topic 2: User Interface Development | - Building iOS interfaces
|
| Topic 3: App Lifecycle and Deployment Concepts | - Understanding app structure
|
| Topic 4: Introduction to App Development with Swift | - Swift programming fundamentals
|
Apple App Development with Swift Certified User Sample Questions:
Review the code snippet.
What will print after the final line of code is executed?
Answer the question by typing in the box.
2
Explanation:
This question belongs to Swift Programming Language , specifically the objective on variable scope and shadowing .
The code first declares:
let even = 2
This creates a constant named even in the outer scope with the value 2.
Inside the for loop, the code declares another constant with the same name:
let even = num * 2
This inner even exists only inside the loop body. It shadows the outer even, which means that within the loop, the name even refers to the loop's local constant, not the original one. However, that inner constant goes out of scope at the end of each loop iteration.
After the loop finishes, the inner even no longer exists. So when the final line runs:
print(even)
Swift uses the original outer constant, which is still 2.
So the output is:
2
This question tests two important Swift concepts:
* Scope : where a variable or constant can be accessed
* Shadowing : when a local declaration temporarily hides another declaration with the same name Therefore, the correct answer is 2 .
Which property wrapper allows you to read data from the system or device settings?
- A. @Binding
- B. @StateObject
- C. @Environment
- D. @State
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
Complete the code by selecting the correct option from each drop-down list to create the following screen.
Note: You will receive partial credit for each correct answer.
Why does the initializer for the following struct need the keyword self?
- A. self is used to indicate to the reader that the parameter is being referenced.
- B. self is only needed when the property does not have a default value.
- C. self is needed to distinguish between the property and the parameter with the same name.
- D. self is always needed when you are setting properties in an initializer.
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
What is the code snippet an example of?
- A. Implicitly unwrapped optional
- B. Optional binding
- C. Force unwrapping
- D. Optional chaining
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
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