Building a Simple Rust Application

Are you ready to dive into the world of Rust programming? If you're looking for a language that's fast, efficient, and safe, then Rust is the perfect choice. In this article, we'll walk you through the process of building a simple Rust application from scratch.

But first, let's talk a bit about Rust. Rust is a systems programming language that's designed to be safe, concurrent, and fast. It's perfect for building high-performance applications that require low-level control over system resources. Rust is also known for its memory safety features, which prevent common programming errors like null pointer dereferences and buffer overflows.

Now that you know a bit about Rust, let's get started with building our application. We'll be building a simple command-line tool that takes a string as input and reverses it.

Setting Up Your Environment

Before we can start coding, we need to set up our development environment. The first step is to install Rust. You can download Rust from the official website at

Once you've installed Rust, you can check that it's working by opening a terminal and running the following command:

$ rustc --version

This should output the version of Rust that you've installed.

Next, we'll create a new Rust project. Open a terminal and navigate to the directory where you want to create your project. Then, run the following command:

$ cargo new reverse-string

This will create a new Rust project called "reverse-string". Cargo is Rust's package manager and build tool, and it will create a basic project structure for us.

Writing the Code

Now that we've set up our environment and created a new project, we can start writing our code. Open the "reverse-string" directory in your favorite code editor.

The first thing we'll do is create a new Rust file called "". This is where our application code will go.

In "", we'll start by defining a function called "reverse_string". This function will take a string as input and return a new string that's the reverse of the input string. Here's the code:

fn reverse_string(input: &str) -> String {

This code uses Rust's built-in "chars" iterator to iterate over the characters in the input string. We then call the "rev" method to reverse the order of the characters, and finally, we use the "collect" method to collect the reversed characters into a new string.

Next, we'll define the main function that will run our application. Here's the code:

fn main() {
    let input = "Hello, world!";
    let output = reverse_string(input);
    println!("{}", output);

This code defines a variable called "input" that contains the string "Hello, world!". We then call our "reverse_string" function with this input and store the result in a variable called "output". Finally, we print the output to the console using Rust's built-in "println" macro.

Building and Running the Application

Now that we've written our code, we can build and run our application. Open a terminal and navigate to the "reverse-string" directory. Then, run the following command:

$ cargo run

This will compile and run our application. You should see the following output in your terminal:

!dlrow ,olleH

Congratulations! You've just built your first Rust application.


In this article, we've walked you through the process of building a simple Rust application from scratch. We've covered the basics of Rust programming, including setting up your environment, writing code, and building and running your application.

Rust is a powerful language that's perfect for building high-performance applications that require low-level control over system resources. If you're interested in learning more about Rust, be sure to check out the official Rust documentation at

Thanks for reading, and happy coding!

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Written by AI researcher, Haskell Ruska, PhD ( Scientific Journal of AI 2023, Peer Reviewed