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Module quiz: Advanced data types :Advanced Programming in Swift (Meta iOS Developer Professional Certificate) Answers 2026

Question 1

The code below demonstrates two separate ways to declare a set.

var cities: Set = ["Cairo", "London", "Paris"]
var cities2: Set<String> = ["Moscow", "Hanoi", "Zurich"]

✅ True
❌ False

Explanation: Dono syntaxes valid hain. Pehle me type inference ho raha hai, doosre me explicitly Set<String> diya gaya hai.

Question 2

What is the output of the code?

var numbersA : Set = [100, 102, 103]
var numbersB : Set = [101, 103, 100]
let numbers = numbersA.union(numbersB)
print(numbers)

❌ [100, 100, 102, 103]
❌ [100, 101, 103, 101]
✅ [100, 102, 103, 101]
❌ [103, 102, 103, 101]

Explanation: Set unique values rakhta hai aur order guaranteed nahi hota. Union ke baad unique elements milte hain: 100, 101, 102, 103.

Question 3

What is the output of the following code?

enum Week: Int, CaseIterable {
case Monday = 1
case Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
}

for day in Week.allCases {
print("\(day) is day \(day.rawValue) of the week")
}

❌ Monday is day 1 of the week
✅ Monday is day 1 of the week
Tuesday is day 2 of the week
Wednesday is day 3 of the week
Thursday is day 4 of the week
Friday is day 5 of the week
Saturday is day 6 of the week
❌ An error is thrown because only Monday has a raw value.
❌ No error but no output

Explanation: Int raw values automatically increment hote hain aur CaseIterable se loop possible hota hai.

Question 4

Which of the following can be applied to an enum? (Select all that apply)

✅ Functions
✅ Computed properties
✅ Raw values

Explanation: Swift enums kaafi powerful hote hain — methods, computed properties aur raw values sab support karte hain.

Question 5

What is the raw type of the following enum?

enum PastaTypes {
case spaghetti
case penne
case ravioli
case rigatoni
}

❌ Double
❌ String
❌ Int
✅ None of the above

Explanation: Jab raw type specify nahi hota, enum ka koi raw type nahi hota.

Question 6

What will the output of the following code be?

enum PastaTypes: Int {
case spaghetti
case penne
case ravioli
case rigatoni
}

print(PastaTypes.penne.rawValue)

❌ 0
✅ 1
❌ 2
❌ None of the above

Explanation: Default raw value 0 se start hota hai → spaghetti = 0, penne = 1.

Question 7

To use allCases property in your code, which protocol must an enum conform to?

❌ Hashable
✅ CaseIterable
❌ Equatable

Explanation: allCases tabhi milta hai jab enum CaseIterable conform kare.

Question 8

What will the output of the following code be?

var ListOfNumbers = Set<Int>()

ListOfNumbers.insert(1)
ListOfNumbers.insert(5)
ListOfNumbers.insert(8)
ListOfNumbers.insert(3)
ListOfNumbers.insert(1)

print(ListOfNumbers.count)

❌ 5
✅ 4
❌ None of the above

Explanation: Set duplicate values allow nahi karta. 1 do baar insert hua, lekin count unique = 4.

Question 9

Which of the statements is true about sets?

✅ Can only store distinct unordered values of the same type.
❌ Contains elements in a collection that don’t necessarily need to be unique.
❌ Contains elements that have key-value pairs where each key must be unique.

Explanation: Ye dictionary ka description hai, set ka nahi.

Question 10

In the scenario when there is a large amount of data expected and performance is of crucial importance, which collection should you use?

❌ Array
✅ Set

Explanation: Set fast lookup (O(1)) deta hai, jab performance critical ho.

🧾 Summary Table

Question Correct Answer
Q1 True
Q2 [100, 102, 103, 101]
Q3 Full week output
Q4 Functions, Computed properties, Raw values
Q5 None of the above
Q6 1
Q7 CaseIterable
Q8 4
Q9 Distinct unordered values
Q10 Set