# Function std::cmp::max_by_key[−][src]

    #[must_use]pub fn max_by_key<T, F, K>(v1: T, v2: T, f: F) -> T where
        F: FnMut(&T) -> K,
        K: Ord,

🔬 This is a nightly-only experimental API. (`cmp_min_max_by` #64460)

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

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

# Examples

    #![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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