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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0

Browser: Firefox 82

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
entries	61798.1 Ops/sec
keys	46348.5 Ops/sec
values	33684.1 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]; } });

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

entries

keys

values