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

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• 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.

examples/loops/enumerate/src/main.rs

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