Rust Immutable

Rust immutable

Created By: chatGPT

In Rust, variables are immutable by default. This means that once a variable is assigned a value, it cannot be changed. This is a key feature in Rust that helps to ensure safety and concurrency. If you try to modify an immutable variable, you will receive a compile-time error.

let x = 5;
// x = 6; // This will cause an error!

To create a mutable variable, you need to use the mut keyword. This allows you to change the value of the variable after it has been initialized. However, you should be mindful of using mutable variables, as they can introduce risks in concurrent programming.

let mut y = 10;
y = 20; // This is fine because y is mutable

Using immutability promotes a functional programming style, making it easier to reason about your code and avoid side effects. Here's an example of using both immutable and mutable variables in a simple function.

fn example() {
    let immutable_var = 1;
    let mut mutable_var = 2;

    // Uncommenting the next line will cause a compile error
    // immutable_var = 10;

    mutable_var += 5; // This is allowed
    println!("Immutable: {}, Mutable: {}", immutable_var, mutable_var);
}