How does borrowing work with slices

Borrowing with slices works by creating a reference to a contiguous sequence of elements within a collection without taking ownership of the whole collection. You create a slice by specifying a range or using the .. syntax, which borrows the underlying data for the duration of the reference.

fn first_word(s: &str) -> &str {
    let bytes = s.as_bytes();
    for (i, &item) in bytes.iter().enumerate() {
        if item == b' ' {
            return &s[0..i];
        }
    }
    &s[..]
}

fn main() {
    let my_string = String::from("hello world");
    let word = first_word(&my_string);
    println!("The first word is {}", word);
}

A slice is like pointing to a specific section of a book without buying the whole book. Borrowing allows you to read that section while the original owner keeps the book. This lets you work with parts of data safely without copying everything or losing access to the original.