Iterate over both index and value of a vector (enumerate)

• for

• iter

• enumerate

• Instead of getting the index of the current element of Rust, we can either iteratore over the indices or use enumerate.

• First example: iterating over the values.

• Second example: iterating over the indices and getting the value. This triggers a needless_range_loop suggesting the third solution:

• Third example: Creating an iterator out of the vector and calling enumerate on it. This will allow us to iterate over the index-value pairs.

fn main() {
    let animals = vec!["cat", "snake", "camel"];
    for animal in &animals {
        println!("{animal}");
    }
    println!();

    #[allow(clippy::needless_range_loop)]
    for ix in 0..animals.len() {
        println!("{ix} {}", animals[ix]);
    }
    println!();

    for (ix, animal) in animals.iter().enumerate() {
        println!("{ix} {animal}");
    }
}

cat
snake
camel

0 cat
1 snake
2 camel

0 cat
1 snake
2 camel