0_bench_result.txt

sum:

test bench_cloned ... bench:          60 ns/iter (+/- 0)
test bench_map    ... bench:          60 ns/iter (+/- 1)
test bench_pat    ... bench:          61 ns/iter (+/- 3)

find string:

test bench_cloned ... bench:       1,129 ns/iter (+/- 72)
test bench_map    ... bench:       1,133 ns/iter (+/- 142)
test bench_pat    ... bench:       1,133 ns/iter (+/- 54)

1_bench_sum.rs

#![feature(test)]
extern crate test;
use test::Bencher;
use test::black_box;

#[bench]
fn bench_cloned(b: &mut Bencher) {
    let strings = black_box(vec![1; 1000]);
    b.iter(|| {
        let mut s = 0;
        for i in strings.iter().cloned() {
            s += i;
        }
        s
    })
}


#[bench]
fn bench_map(b: &mut Bencher) {
    let strings = black_box(vec![1; 1000]);
    b.iter(|| {
        let mut s = 0;
        for i in strings.iter().map(|&x| x) {
            s += i;
        }
        s
    })
}

#[bench]
fn bench_pat(b: &mut Bencher) {
    let strings = black_box(vec![1; 1000]);
    b.iter(|| {
        let mut s = 0;
        for &i in strings.iter() {
            s += i;
        }
        s
    })
}

2_bench_find_string.rs

#![feature(test)]
extern crate test;
use test::Bencher;
use test::black_box;

#[bench]
fn bench_cloned(b: &mut Bencher) {
    let strings = black_box(vec!["abcd"; 1000]);
    let find = black_box("boo");
    b.iter(|| {
        for (i, x) in strings.iter().cloned().enumerate() {
            if x == find {
                return Some(i);
            }
        }
        None
    })
}


#[bench]
fn bench_map(b: &mut Bencher) {
    let strings = black_box(vec!["abcd"; 1000]);
    let find = black_box("boo");
    b.iter(|| {
        for (i, x) in strings.iter().map(|&x| x).enumerate() {
            if x == find {
                return Some(i);
            }
        }
        None
    })
}

#[bench]
fn bench_pat(b: &mut Bencher) {
    let strings = black_box(vec!["abcd"; 1000]);
    let find = black_box("boo");
    b.iter(|| {
        for (i, &x) in strings.iter().enumerate() {
            if x == find {
                return Some(i);
            }
        }
        None
    })
}