algorithm - What is the idiomatic way to get the index of a maximum or minimum floating point value in a slice or Vec in Rust?

Question

Assumption -- The Vec<f32> does not have any NaN values or exhibit any NaN behavior.

Take the following sample set:

0.28  
0.3102
0.9856
0.3679
0.3697
0.46  
0.4311
0.9781
0.9891
0.5052
0.9173
0.932 
0.8365
0.5822
0.9981
0.9977

What is the neatest and most stable way to get the index of the highest value in the above list (values can be negative)?

My initial attempts were along the following lines:

let _tmp = *nets.iter().max_by(|i, j| i.partial_cmp(j).unwrap()).unwrap();    
let _i = nets.iter().position(|&element| element == _tmp).unwrap();

Where nets is a &Vec<f32>. Which to me seems blatantly incorrect.

The Python equivalent of this that works (taking into consideration the above assumption):

_i = nets.index(max(nets))

Answer 1

Is there a reason why this wouldn't work?

use std::cmp::Ordering;

fn example(nets: &Vec<f32>) {
    let index_of_max: Option<usize> = nets
        .iter()
        .enumerate()
        .max_by(|(_, a), (_, b)| a.partial_cmp(b).unwrap_or(Ordering::Equal))
        .map(|(index, _)| index);
}