How to Get Length of a Set in Rust - Step by Step Examples

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How to Get Length of a Set in Rust ?

Answer

To get the size of a set in Rust, you can use the len method on the set.

✐ Examples

1 Get Size of Set

In this example,

We create a set named set1 using the HashSet type from the std::collections module with some elements.
We use the len method on the set object set1 to get the number of elements in the set.
The len method returns the size of the set.
Finally, we print the size of the set to standard output.

Rust Program

use std::collections::HashSet;

fn main() {
    let mut set1 = HashSet::new();
    set1.insert("apple");
    set1.insert("banana");
    set1.insert("cherry");

    let size = set1.len();
    println!("Size of set1: {}", size);
}

Output

Size of set1: 3

2 Get Size of Empty Set

In this example,

We create an empty set named empty_set using the HashSet type from the std::collections module.
We use the len method on the set object empty_set to get the number of elements in the set.
Since the set is empty, the len method returns 0.
Finally, we print the size of the empty set to standard output.

Rust Program

use std::collections::HashSet;

fn main() {
    let empty_set: HashSet<&str> = HashSet::new();

    let size = empty_set.len();
    println!("Size of empty_set: {}", size);
}

Output

Size of empty_set: 0

Summary

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

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