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

How to create a Set of Sets in Rust ?

Answer

To create a set of sets in Rust, you can use the HashSet from the std::collections module. Each inner set can also be a HashSet.


✐ Examples

1 Creating a Set of Sets with Integers

In this example,

  1. First, include the necessary module by adding use std::collections::HashSet; at the top of your code file. This allows you to use the HashSet type.
  2. Then, create a new instance of a HashSet named set_of_sets, where each element is another HashSet. This is done by declaring let mut set_of_sets: HashSet> = HashSet::new();.
  3. Next, create a few inner sets. For example, let set1: HashSet = [1, 2, 3].iter().cloned().collect(); initializes a set containing the integers 1, 2, and 3.
  4. Similarly, create another set like let set2: HashSet = [4, 5, 6].iter().cloned().collect();.
  5. Add these inner sets to the outer set using the insert method: set_of_sets.insert(set1); and set_of_sets.insert(set2);.
  6. To demonstrate the structure, iterate over the outer set and print each inner set's elements. Use a nested for loop for this: for inner_set in &set_of_sets followed by for item in inner_set.
  7. Print each item within the inner loop to display the elements of each inner set.

Rust Program

use std::collections::HashSet;

fn main() {
    // Step 1: Create the outer set of sets
    let mut set_of_sets: HashSet<HashSet<i32>> = HashSet::new();

    // Step 2: Create inner sets
    let set1: HashSet<i32> = [1, 2, 3].iter().cloned().collect();
    let set2: HashSet<i32> = [4, 5, 6].iter().cloned().collect();

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

    // Step 4: Iterate and print the elements of each inner set
    for inner_set in &set_of_sets {
        println!("Inner set:");
        for item in inner_set {
            print!("{} ", item);
        }
        println!("");
    }
}

Output

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

2 Creating a Set of Sets with Strings

In this example,

  1. First, include the necessary module by adding use std::collections::HashSet; at the top of your code file. This allows you to use the HashSet type.
  2. Create a new instance of a HashSet named set_of_sets, where each element is another HashSet. This is done by declaring let mut set_of_sets: HashSet> = HashSet::new();.
  3. Create a few inner sets. For example, let set1: HashSet = ["apple", "banana"].iter().cloned().collect(); initializes a set containing the strings "apple" and "banana".
  4. Create another set like let set2: HashSet = ["cherry", "date"].iter().cloned().collect();.
  5. Add these inner sets to the outer set using the insert method: set_of_sets.insert(set1); and set_of_sets.insert(set2);.
  6. To demonstrate the structure, iterate over the outer set and print each inner set's elements. Use a nested for loop for this: for inner_set in &set_of_sets followed by for item in inner_set.
  7. Print each item within the inner loop to display the elements of each inner set.

Rust Program

use std::collections::HashSet;

fn main() {
    // Step 1: Create the outer set of sets
    let mut set_of_sets: HashSet<HashSet<String>> = HashSet::new();

    // Step 2: Create inner sets
    let set1: HashSet<String> = ["apple", "banana"].iter().cloned().collect();
    let set2: HashSet<String> = ["cherry", "date"].iter().cloned().collect();

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

    // Step 4: Iterate and print the elements of each inner set
    for inner_set in &set_of_sets {
        println!("Inner set:");
        for item in inner_set {
            print!("{} ", item);
        }
        println!("");
    }
}

Output

Inner set:
apple banana 
Inner set:
cherry date

Summary

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


More Rust Sets Tutorials

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