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

How to check if a Vector is Empty in Rust ?

Answer

To check if a vector is empty in Rust, you can use the is_empty method, which returns true if the vector has no elements.

✐ Examples

1 Check if a Numeric Vector is Empty

In this example,

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

Rust Program

fn main() {
    let num_vec: Vec<i32> = vec![];
    if num_vec.is_empty() {
        println!("Numeric vector is empty");
    } else {
        println!("Numeric vector is not empty");
    }
}

Output

Numeric vector is empty

2 Check if a String Vector is Empty

In this example,

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

Rust Program

fn main() {
    let str_vec: Vec<&str> = vec![];
    if str_vec.is_empty() {
        println!("String vector is empty");
    } else {
        println!("String vector is not empty");
    }
}

Output

String vector is empty

Summary

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

◀ Previous Next ▶