Benchmark: object keys vs loop - MeasureThat.net

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);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fori
forin
foreach
backwhile
forcachelen
4of
backfor

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 7 years ago)

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/OS: Chrome 54 on Windows 8.1

View result in a separate tab

Test name	Executions per second
fori	487099.6 Ops/sec
forin	732501.1 Ops/sec
foreach	673884.9 Ops/sec
backwhile	977289.3 Ops/sec
forcachelen	567042.9 Ops/sec
4of	706353.4 Ops/sec
backfor	514949.0 Ops/sec