Run results for: isEmpty tests

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Browser: Chrome 95

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
isEmpty1	2611.9 Ops/sec
isEmpty2	7837.2 Ops/sec

Script Preparation code:

function isEmpty1(obj) {
    return (Object.keys(obj).length === 0) && obj.constructor === Object;
}
function isEmpty2(obj) {
    for (key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) {
        return false;
      }
    }
    return true;
}
var a = {};

AخA
 
function isEmpty1(obj) {    return (Object.keys(obj).length === 0) && obj.constructor === Object;}function isEmpty2(obj) {    for (key in obj) {      if (Object.prototype.hasOwnProperty.call(obj, key)) {        return false;      }    }    return true;}var a = {};

Tests:

isEmpty1
var count = 1000; for (i=0;i<count;i++) isEmpty1(a);
var count = 1000;
for (i=0;i<count;i++) isEmpty1(a);
isEmpty2
var count = 1000; for (i=0;i<count;i++) isEmpty2(a);
var count = 1000;
for (i=0;i<count;i++) isEmpty2(a);