```rust
fn main() {
    let mut s1 = String::from("hello");

    // Pass a mutable reference to the function
    change(&mut s1);

    println!("{}", s1);
}

fn change(s: &mut String) {
    s.push_str(", world");
}
// s goes out of scope, but since
// it's a mutable reference, nothing is freed
```

Example of Mutable Reference - Rust Programming

Structs are user-defined data types that allow you to group related values of different data types under one name. They are similar to structures in C/C++ or objects in other languages. They are primarily used to organize and represent data.

Struct - Rust Programming

Mutable references, also known as exclusive references, allow you to access and modify a value. However, only one mutable reference to a value can exist within a given scope, ensuring that no data races occur.

University of Michigan - Ann Arbor

- Immutable Reference
- Mutable Reference

Types of References - Rust Programming

rust-lang.org

Mutable Reference - Rust Programming

Immutable references, which are also called shared references, enable you to retrieve a value without making any changes to it. Numerous immutable references can exist concurrently to a value.

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