How to check if a Set is Empty in Rust - Step by Step Examples

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How to check if a Set is Empty in Rust ?

Answer

To check if a Set is empty in Rust, you can use the is_empty method or compare the len to zero.

✐ Examples

1 Check if Set is Empty Using is_empty Method

In this example,

We define a set named `my_set` containing elements of a specific type.
We use the `is_empty` method to check if the set is empty.
If the `is_empty` method returns `true`, then the set is empty; otherwise, it contains elements.

Rust Program

use std::collections::HashSet;

fn main() {
    // Define set
    let my_set: HashSet<i32> = HashSet::new();

    // Check if set is empty using is_empty method
    if my_set.is_empty() {
        println!("Set is empty");
    } else {
        println!("Set is not empty");
    }
}

Output

Set is empty

2 Check if Set is Empty Using len Method

In this example,

We define a set named `my_set` containing elements of a specific type.
We use the `len` method to get the number of elements in the set.
If the length is equal to zero, then the set is empty; otherwise, it contains elements.

Rust Program

use std::collections::HashSet;

fn main() {
    // Define set
    let my_set: HashSet<i32> = HashSet::new();

    // Check if set is empty using len method
    if my_set.len() == 0 {
        println!("Set is empty");
    } else {
        println!("Set is not empty");
    }
}

Output

Set is empty

Summary

In this tutorial, we learned How to check if a Set is Empty in Rust language with well detailed examples.

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How to check if a Set is Empty in Rust - Step by Step Examples

How to check if a Set is Empty in Rust ?

Answer

✐ Examples

1 Check if Set is Empty Using is_empty Method

Rust Program

Output

2 Check if Set is Empty Using len Method

Rust Program

Output

Summary

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