How to check if a Set is Not Empty in Rust

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How to check if a Set is Not Empty in Rust ?

Answer

In Rust, you can use the is_empty() method to check if a Set is not empty.

✐ Examples

1 Check if Set is Not Empty

In this example,

We declare a Set using the HashSet type from the Rust standard library and initialize it with some elements.
We use the is_empty() method on the Set to determine if it contains any elements.
If the Set is not empty, the is_empty() method returns false; otherwise, it returns true.
We print the result to the standard output to indicate whether the Set is not empty or not.

Rust Program

use std::collections::HashSet;

fn main() {
    let mut my_set = HashSet::new(); // Or let mut my_set: HashSet<i32> = HashSet::new();
    my_set.insert(1);
    if !my_set.is_empty() {
        println!("The Set is not empty");
    } else {
        println!("The Set is empty");
    }
}

Output

The Set is not empty

2 Check if Empty Set is Not Empty

In this example,

We declare an empty Set using the HashSet type.
We use the is_empty() method on the Set to determine if it contains any elements.
Since the Set is empty, the is_empty() method returns true.
We print the result to the standard output to indicate that the Set is indeed empty.

Rust Program

use std::collections::HashSet;

fn main() {
    let empty_set: HashSet<i32> = HashSet::new();
    if !empty_set.is_empty() {
        println!("The Set is not empty");
    } else {
        println!("The Set is empty");
    }
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Not Empty in Rust language with well detailed examples.

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How to check if a Set is Not Empty in Rust

How to check if a Set is Not Empty in Rust ?

Answer

✐ Examples

1 Check if Set is Not Empty

Rust Program

Output

2 Check if Empty Set is Not Empty

Rust Program

Output

Summary

More Rust Sets Tutorials