How to create a Set of Sets in Swift - Step by Step Examples

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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,

First, create a new instance of a Set named setOfSets, where each element is another Set. This is done by declaring var setOfSets: Set> = [].
Next, create a few inner sets. For example, let set1: Set = [1, 2, 3] initializes a set containing the integers 1, 2, and 3.
Similarly, create another set like let set2: Set = [4, 5, 6].
Add these inner sets to the outer set using the insert method: setOfSets.insert(set1) and setOfSets.insert(set2).
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.
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,

First, create a new instance of a Set named setOfSets, where each element is another Set. This is done by declaring var setOfSets: Set> = [].
Create a few inner sets. For example, let set1: Set = ["apple", "banana"] initializes a set containing the strings "apple" and "banana".
Create another set like let set2: Set = ["cherry", "date"].
Add these inner sets to the outer set using the insert method: setOfSets.insert(set1) and setOfSets.insert(set2).
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.
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.

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