How to check if a Vector is Not Empty in Rust - Step by Step Examples

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

Answer

To check if a vector is not empty in Rust, you can use the is_empty method, which returns false if the vector has elements.

✐ Examples

1 Check if a Numeric Vector is Not Empty

In this example,

We create a numeric vector named num_vec with several elements.
We use the is_empty method to check if num_vec is not empty.
If !num_vec.is_empty() returns true, it means the vector is not empty.
We print a message indicating whether the vector is not empty or not.

Rust Program

fn main() {
    let num_vec = vec![10, 20, 30, 40, 50];
    if !num_vec.is_empty() {
        println!("Numeric vector is not empty");
    } else {
        println!("Numeric vector is empty");
    }
}

Output

Numeric vector is not empty

2 Check if a String Vector is Not Empty

In this example,

We create a string vector named str_vec with several elements.
We use the is_empty method to check if str_vec is not empty.
If !str_vec.is_empty() returns true, it means the vector is not empty.
We print a message indicating whether the vector is not empty or not.

Rust Program

fn main() {
    let str_vec = vec!["apple", "banana", "cherry", "date"];
    if !str_vec.is_empty() {
        println!("String vector is not empty");
    } else {
        println!("String vector is empty");
    }
}

Output

String vector is not empty

Summary

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

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How to check if a Vector is Not Empty in Rust - Step by Step Examples

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

Answer

✐ Examples

1 Check if a Numeric Vector is Not Empty

Rust Program

Output

2 Check if a String Vector is Not Empty

Rust Program

Output

Summary

More Rust Vectors Tutorials