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Rust: Check if an array is empty

In Rust, working with arrays is a common task in programming. One of the frequent checks that need to be done when working with arrays is to check if the array is empty. This tutorial will provide a guide on how to check if an array is empty in Rust using different methods. We will take a look at using the len() method and is_empty() method to check if an array is empty in Rust. The examples and explanations provided in this tutorial will help you understand how to implement these techniques in your own projects. Whether you are a beginner or an experienced Rust developer, this tutorial will help you improve your understanding of array validation in Rust.

Check if an array is empty in Rust Examples

Using the len() method

The most straightforward way to check if an array is empty is by using the len() method. The len() method returns the number of elements in an array. If the len() method returns 0, it means that the array is empty.

fn main() {
    let my_array = [1, 2, 3];

    if my_array.len() == 0 {
        println!("The array is empty.");
    } else {
        println!("The array is not empty.");
    }
}

In this example, we first check the length of the my_array variable using the len() method. If the length is 0, it means that the array is empty. Otherwise, the array is not empty.

Using the is_empty() method

Another way to check if an array is empty in Rust is by using the is_empty() method. The is_empty() method returns a boolean value indicating whether an array is empty or not.

fn main() {
    let my_array = [1, 2, 3];

    if my_array.is_empty() {
        println!("The array is empty.");
    } else {
        println!("The array is not empty.");
    }
}

In this example, we first check if the my_array variable is empty using the is_empty() method. If the method returns true, it means that the array is empty. Otherwise, the array is not empty.

Conclusion

Checking if an array is empty in Rust can be done using the len() method or the is_empty() method. Both methods are easy to use and provide a clear indication of whether an array is empty or not.

It's important to note that the examples provided are for fixed-size arrays. For dynamic-size arrays (Vec, VecDeque etc.) the same methods are available and work the same way.

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Written by Vinish Kapoor

An Oracle Apex Consultant, Oracle ACE, and founder of foxinfotech.org and orclqa.com a question and answer forum for developers. You can connect with me on Facebook and Twitter.