Run results for: Object.values for, forEach vs Object for-in overhead cost

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Object.values for

73K/s

Object.values forEach

49K/s

Object for-in

30K/s

View exact numbers

Script Preparation code:

var myObj = {};
for (var i = 0; i < 1000; i++) {
    myObj['val' + i] = 'val' + i;
}

Tests:

Object.values for
var objValues = Object.values(myObj); var myStr = ''; for (var i = 0; i < objValues.length; i++) { myStr += objValues[i]; }
Object.values forEach
var myStr = ''; Object.values(myObj).forEach(el => myStr += el);
Object for-in
var myStr = ''; for (const o in myObj) { myStr += myObj[o]; }