Rust function with parameter (&str)

---

• Functions can expect parameters.
• We have to define the type of the parameter.
• In this case we are expecting a string slice &str.
• If we already have a string slice we can pass it as it is.
• If we have a String then we have to prefix it with &.

examples/functions/hello-foo/src/main.rs

fn main() {
    greet("Foo");
    greet("Bar");
    println!();

    let name = "Foo";
    greet(name);
    greet(name);
    println!();

    let name = "Bar".to_string();
    greet(&name);
    greet(&name);
}

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

Hello Foo!
Hello Bar!

Hello Foo!
Hello Foo!

Hello Bar!
Hello Bar!