Run results for: hb-2365-test (tes1t)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

Browser: Chrome 72

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
1	114.3 Ops/sec
2	321.5 Ops/sec

Script Preparation code:

const arr = Array(500).fill(null);
var parents = arr.map(() => {
    return {
        children: arr.map((value, index) => ({value, selected: index % 2})),
    };
});

Tests:

1
const out = []; parents.forEach(parent => { out.push(...parent.children.filter(child => child.selected).map(({value}) => value)); });
2
const out = []; parents.forEach(parent => { parent.children.forEach(child => child.selected && out.push(child.value)); });