min_by_key

core::cmp

Function min_by_key 

1.53.0 (const: unstable) · Source 
pub fn min_by_key<T, F, K>(v1: T, v2: T, f: F) -> T
where
    T:,
    F: FnMut(&T) -> K,
    K: Ord,
Available on non-crate feature ferrocene_certified only.
Expand description

Returns the element that gives the minimum value from the specified function.

Returns the first argument if the comparison determines them to be equal.

§Examples

use std::cmp;

let result = cmp::min_by_key(2, -1, |x: &i32| x.abs());
assert_eq!(result, -1);

let result = cmp::min_by_key(2, -3, |x: &i32| x.abs());
assert_eq!(result, 2);

let result = cmp::min_by_key(1, -1, |x: &i32| x.abs());
assert_eq!(result, 1);