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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