Run results for: object keys vs loop - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Browser: Chrome 54

Operating system: Windows 8.1

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
fori	445492.6 Ops/sec
forin	509414.6 Ops/sec
foreach	477337.7 Ops/sec
backwhile	842663.6 Ops/sec
forcachelen	559678.1 Ops/sec
4of	489046.6 Ops/sec
backfor	561784.3 Ops/sec

Website performance monitoring

Script Preparation code:

var a = [{"id":7,"h":76},{"id":4,"h":34},{"id":9,"h":89}];
var d = [];

Tests:

fori
for(var i=0;i<a.length;i++)d.push(a[i].id);
forin
for(var i in a)d.push(i.id);
foreach
a.forEach((i)=>d.push(i.id));
backwhile
var i = a.length; while(--i)d.push(a[i].id);
forcachelen
var z = a.length; for(var i=0;i<z;i++)d.push(a[i].id);
4of
for(var i of a)d.push(i.id);
backfor
for(var i=a.length-1;i>=0;i--)d.push(a[i].id);