pub fn max_by_key<T, F, K>(v1: T, v2: T, f: F) -> T where F: FnMut(&T) -> K, K: Ord,
Returns the element that gives the maximum value from the specified function.
Returns the second argument if the comparison determines them to be equal.
#![feature(cmp_min_max_by)] use std::cmp; assert_eq!(cmp::max_by_key(-2, 1, |x: &i32| x.abs()), -2); assert_eq!(cmp::max_by_key(-2, 2, |x: &i32| x.abs()), 2);
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https://doc.rust-lang.org/std/cmp/fn.max_by_key.html