# Function std::cmp::max_by_key

1.53.0 · source ·

    pub fn max_by_key<T, F, K>(v1: T, v2: T, f: F) -> Twhere
        F: FnMut(&T) -> K,
        K: Ord,

Expand description

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

    use std::cmp;

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

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

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