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max_by_key

std::cmp

Functionmax_by_key 

1.53.0 (const:unstable) ·Source
pub fn max_by_key<T, F, K>(v1: T, v2: T, f: F) -> T
where    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

usestd::cmp;letresult = cmp::max_by_key(3, -2, |x:&i32| x.abs());assert_eq!(result,3);letresult = cmp::max_by_key(1, -2, |x:&i32| x.abs());assert_eq!(result, -2);letresult = cmp::max_by_key(1, -1, |x:&i32| x.abs());assert_eq!(result, -1);
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