core::cmp::max_by_key - Rust
Description: API documentation for the Rust `max_by_key` fn in crate `core`.
Keywords: rust, rustlang, rust-lang, max_by_key

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

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

🔬 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);Run