Run results for: Object.key vs Object.value vs Object.entries

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36

Browser: Chrome 144

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 5 months ago

keys

491K/s

entries

157K/s

values

123K/s

View exact numbers

Test name	Executions per second
✓ keys	491,061 Ops/sec
entries	157,165 Ops/sec
values	123,344 Ops/sec

Script Preparation code:

function makeid() {
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for (var i = 0; i < 5; i++)
        text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}

window.parentObj = {};

for (let i = 0; i < 100; i++) {
    window.parentObj[makeid()] = {
        innerVal: makeid()
    };
}

Tests:

entries
const newObj = {}; Object.entries(window.parentObj).forEach(([k, v], i) => { if ((i % 2) === 0) { newObj[k] = v; } });
keys
const newObj = {}; Object.keys(window.parentObj).forEach((k, i) => { if ((i % 2) === 0) { newObj[k] = window.parentObj[k]; } });
values
const newObj = {}; Object.values(window.parentObj).forEach((k, i) => { if ((i % 2) === 0) { newObj[k] = window.parentObj[k]; } });