Indices_vs_Iterators.rs

//Index impl
pub fn main() {
    let mut my_vec = vec![3, 2, 1];
    for _ in 0..my_vec.len() {
        for i in 0..my_vec.len() - 1 {
            if my_vec[i] > my_vec[i + 1] {
                let tmp = my_vec[i];
                my_vec[i] = my_vec[i + 1];
                my_vec[i + 1] = tmp;
             }
        }
    }
    println!("{:?}", my_vec);
}

//Iterator impl #1
use std::mem;

pub fn main() {
    let mut my_vec = vec![None, None, Some(1)];
    (0..my_vec.len())
              .for_each(|_| {
                let mut iter = my_vec.iter_mut();
                let mut prev = iter.nth(0).expect("internal error: outer loop guard failure");
                iter.for_each(|curr| {
                    if prev > curr { mem::swap(prev, curr) }
                    prev = curr;
                });
              });       
    println!("{:?}", my_vec);
}

//Iterator impl #2
use std::mem;

fn main() {
    let mut my_vec = vec![3, 2, 1];
    (0..my_vec.len())
              .for_each(|_| {
                let mut iter = my_vec.iter_mut();
                let mut prev = None;
                iter.for_each(|curr| {
                    if let Some(prev) = prev {
                        if prev > curr { mem::swap(prev, curr) }
                    }                    
                    prev = Some(curr);
                });
              });       
    println!("{:?}", my_vec);
}