Swift Sets and Dictionaries Quiz

Topics: Swift Sets and Swift Dictionaries

Swift Quiz #06 - Swift Sets and Dictionaries

Set is a collection that stores distinct values of the same type with no defined ordering

6 mins read

1. Which code snippet correctly declares an empty set of integers in Swift?

var set: Set<Int> = {}

var set: Set<Int> = []

var set = Set<Int>()

2. What is the output?

 var dict = ["apple": 3, "banana": 5, "orange": 2]
 dict["banana"] = nil

Adds a new key-value pair to the dictionary.

Removes the key-value pair “banana” from the dictionary.

Updates the value associated with the key “banana”

3. What is the output?

 let set1: Set<Int> = [1, 2, 3, 4, 5]
 let set2: Set<Int> = [1, 2]
 let isSuperset = set1.isSuperset(of: set2)
 print(isSuperset)

true

false

4. What is the output?

 let set1: Set<String> = ["Apple", "Banana", "Orange"]
 let set2: Set<String> = ["Banana", "Orange", "Apple"]
 let areEqual = set1 == set2
 print(areEqual)

true

false

5. What is the output?

 let set1: Set<String> = ["Apple", "Banana", "Orange"]
 let set2: Set<String> = ["Banana", "Orange", "Apple"]
 let isStrictSubset = set1.isStrictSubset(of: set2)
 print(isStrictSubset)

true

false

6. What is the output?

 var dictionary: [String: [Int]] = ["Fruits": [1, 2, 3], "Vegetables": [4, 5, 6]]
 let values = Array(dictionary.values.joined())
 print(values.count)

7. What is the output?

 let set1: Set<Int> = [1, 2, 3, 4]
 let set2: Set<Int> = [3, 4, 5, 6]
 let symmetricDifference = set1.symmetricDifference(set2) print(symmetricDifference.count)

8. What is the output?

 let set1: Set<Int> = [1, 2, 3 ]
 let set2: Set<Int> = [1, 2, 3, 4, 5]
 let isStrictSubset = set1.isStrictSubset(of: set2)
 print(isStrictSubset)

true

false

9. What is the difference between superset and strictSuperset?

superset - checks if a set contains all the elements of another set, while strictSuperset - checks if a set is a proper superset of another set.

superset - checks if a set contains all the elements of another set, while strictSuperset - checks it is not equal to, a specified set.

superset - checks if a set is a proper superset of another set, while strictSuperset - checks if a set contains all the elements that are not of another set.