Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

fn first_word(s: &str) -> &str {
    let bytes = s.as_bytes();
    for (i, &byte) in bytes.iter().enumerate() {
        if byte == b' ' {
            return &s[..i];
        }
    }
    s   // whole string is one word
}

fn sum_slice(nums: &[i32]) -> i32 {
    nums.iter().sum()
}

fn main() {
    // String slices
    let sentence = String::from("hello world");
    let word = first_word(&sentence);
    println!("first word = {word}");
    // sentence.clear(); // compile error: mutable borrow while 'word' is live

// &str works for both String refs and literals
    let literal = "foo bar baz";
    println!("first word of literal = {}", first_word(literal));

// Array slice
    let arr = [1, 2, 3, 4, 5];
    println!("sum of arr = {}", sum_slice(&arr));

// Vec slice — &[T] accepts both arrays and vecs
    let v: Vec<i32> = vec![10, 20, 30];
    println!("sum of vec = {}", sum_slice(&v));

// Mutable slice
    let mut data = [3, 1, 4, 1, 5, 9, 2, 6];
    data.sort();
    println!("sorted = {:?}", &data);

// Sub-slice
    let middle = &data[2..6];
    println!("middle slice = {:?}", middle);
}