Run results for: Object filter mappingv3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0

Browser: Firefox 126

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
object.entries	27795.5 Ops/sec
object.keys	18085.0 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 < 1000; i++) {
	window.parentObj[makeid()] = makeid();
}

Tests:

object.entries
const entries = Object.entries(window.parentObj).filter(([k, v], i) => ((i % 2) === 0)); if(entries.length > 0) Object.fromEntries(entries);
object.keys
const keys = Object.keys(window.parentObj).reduce((acc, k, i) => { if ((i % 2) === 0) { acc[k] = window.parentObj[k]; } return acc }, {}); if(Object.keys(keys).length > 0) true;

Run results for: Object filter mappingv3

benchmark comparing the perf of creating a new object by filter out entries

object.entries

object.keys