How to create a Set of Sets in Swift

How to create a Set of Sets in Swift ?

Answer

To create a set of sets in Swift, you can use the Set type. Each inner set can also be a Set.


✐ Examples

1 Creating a Set of Sets with Integers

In this example,

  1. First, create a new instance of a Set named setOfSets, where each element is another Set. This is done by declaring var setOfSets: Set> = [].
  2. Next, create a few inner sets. For example, let set1: Set = [1, 2, 3] initializes a set containing the integers 1, 2, and 3.
  3. Similarly, create another set like let set2: Set = [4, 5, 6].
  4. Add these inner sets to the outer set using the insert method: setOfSets.insert(set1) and setOfSets.insert(set2).
  5. To demonstrate the structure, iterate over the outer set and print each inner set's elements. Use a nested for loop for this: for innerSet in setOfSets followed by for item in innerSet.
  6. Print each item within the inner loop to display the elements of each inner set.

Swift Program

import Foundation

// Step 1: Create the outer set of sets
var setOfSets: Set<Set<Int>> = []

// Step 2: Create inner sets
let set1: Set<Int> = [1, 2, 3]
let set2: Set<Int> = [4, 5, 6]

// Step 3: Add inner sets to the outer set
setOfSets.insert(set1)
setOfSets.insert(set2)

// Step 4: Iterate and print the elements of each inner set
for innerSet in setOfSets {
    print("Inner set:")
    for item in innerSet {
        print(item, terminator: " ")
    }
    print()
}

Output

Inner set:
1 2 3 
Inner set:
4 5 6

2 Creating a Set of Sets with Strings

In this example,

  1. First, create a new instance of a Set named setOfSets, where each element is another Set. This is done by declaring var setOfSets: Set> = [].
  2. Create a few inner sets. For example, let set1: Set = ["apple", "banana"] initializes a set containing the strings "apple" and "banana".
  3. Create another set like let set2: Set = ["cherry", "date"].
  4. Add these inner sets to the outer set using the insert method: setOfSets.insert(set1) and setOfSets.insert(set2).
  5. To demonstrate the structure, iterate over the outer set and print each inner set's elements. Use a nested for loop for this: for innerSet in setOfSets followed by for item in innerSet.
  6. Print each item within the inner loop to display the elements of each inner set.

Swift Program

import Foundation

// Step 1: Create the outer set of sets
var setOfSets: Set<Set<String>> = []

// Step 2: Create inner sets
let set1: Set<String> = ["apple", "banana"]
let set2: Set<String> = ["cherry", "date"]

// Step 3: Add inner sets to the outer set
setOfSets.insert(set1)
setOfSets.insert(set2)

// Step 4: Iterate and print the elements of each inner set
for innerSet in setOfSets {
    print("Inner set:")
    for item in innerSet {
        print(item, terminator: " ")
    }
    print()
}

Output

Inner set:
apple banana 
Inner set:
cherry date

Summary

In this tutorial, we learned How to create a Set of Sets in Swift language with well detailed examples.


More Swift Sets Tutorials

  1. How to create an Empty Set in Swift ?
  2. How to Initialize a Set in Swift ?
  3. How to Get Length of a Set in Swift ?
  4. How to create a Set of size N in Swift ?
  5. How to create a Set of Numbers from 1 to N in Swift ?
  6. How to create a Set of integers in Swift ?
  7. How to create a Set of Strings in Swift ?
  8. How to Access Items in a Set in Swift ?
  9. How to get a Random Item in a Set in Swift ?
  10. How to Iterate Over a Set in Swift ?
  11. How to check if a Set is Empty in Swift ?
  12. How to check if a Set is Not Empty in Swift ?
  13. How to get Subset from a Set in Swift ?
  14. How to check if a Specific Item is present in the Set in Swift ?
  15. How to check if a Set contains all the items of Another Set in Swift ?
  16. How to Sort Items of a Set in Swift ?
  17. How to Copy a Set in Swift ?
  18. How to add an Item to a Set in Swift ?
  19. How to find Union of Two Sets in Swift ?
  20. How to find Intersection of Two Sets in Swift ?
  21. How to check if Two Sets are Equal in Swift ?
  22. How to Convert a Set of Integers to a Set of Strings in Swift ?
  23. How to Convert a Set of Strings to a Set of Integers in Swift ?
  24. How to Convert a Set of Floats to a Set of Strings in Swift ?
  25. How to Convert a Set of Strings to a Set of Floats in Swift ?
  26. How to Filter Items of a Set based on a Condition in Swift ?
  27. How to Remove Specific Item from a Set in Swift ?
  28. How to Remove Items from Set based on a Condition in Swift ?
  29. How to create a Set of Sets in Swift ?