String and &str

Difference between String and string slices (&str).

Difficulty

Beginner

Code

fn greet(name: &str) {
    println!("Hello, {}!", name);
}

fn main() {
    let s1: &str = "string literal";
    let s2: String = String::from("owned string");
    let s3: &str = &s2[..6];

    greet(s1);
    greet(&s2);
    println!("slice: {}", s3);
}

Explanation

This example demonstrates how to use string and &str in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

Browse more examples in the compound-types category to build a complete understanding of this topic.