Rust Programming By Example

Slices

First, a little recap; a slice is a constant view over an array, and &[T] is the constant view of a Vec<T>, whereas &str is the constant view of a String (just like Path is the constant view of a PathBuf and OsStr is the constant view of an OsString). Now that you have this in mind, let's continue!

When a function expects a constant argument of type Vec or String, then always write them as follows:

fn some_func(v: &[u8]) {
    // some code...
}

Instead of:

fn some_code(v: &Vec<u8>) {
    // some code
}

And:

fn some_func(s: &str) {
    // some code...
}

Instead of:

fn some_func(s: &String) {
    // some code...
}

You might be wondering why this is the case. So, let's imagine your function displays your Vec as ASCII characters:

fn print_as_ascii(v: ...