Benchmark: Performance of JavaScript .loops

Script Preparation code:

const array = [];
for (let i = 0; i < 1000000; ++i) {
    result.push({
        a: i,
        b: i / 2,
        r: 0,
    });
}

Tests:

.forEach
array.forEach((x) => { x.r = x.a + x.b; });
for..of
for(const x of array) { x.r = x.a + x.b; }
for..of (destructuring)
const r = []; for(const {a, b} of array) { r.push(a + b); }
.map
array.map(x => x.a + x.b)
.map (destructuring)
array.map(({a,b}) => a + b)
.for (init array)
const r = new Array(array.length); for (let i = 0; i < array.length; ++i) { r[i] = array[i].a + array[i].b; }
.reduce
array.reduce((p, x) => p + x.a + x.b, 0);
.reduce (destructuring)
array.reduce((p, {a,b}) => p + a + b, 0);
for..of (reduce)
let r = 0; for (const x of array) { r += x.a + x.b; }
for..of (reduce) (destructuring)
let r = 0; for (const {a,b} of array) { r += a + b; }

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Windows

Related benchmarks:

Performance of JavaScript .loops (version: 1)