Benchmark: javascript loops performance - MeasureThat.net

Script Preparation code:

var arr = new Array(100000).fill(Math.random());
var lastValue = 0;

Tests:

for
for (var i = 0; i < arr.length; i++) { lastValue = arr[i]; }
for_in
for (var i in arr) { lastValue = arr[i]; }
for_of
for (var v of arr) { lastValue = v; }
forEach
arr.forEach(v => lastValue = v);
map
arr.map(v => lastValue = v);
while
let i = 0; while(i < arr.length) { lastValue = arr[i]; i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
for_in
for_of
forEach
map
while

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Safari/605.1.15

Browser/OS: Safari 16 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
for	43.7 Ops/sec
for_in	37.1 Ops/sec
for_of	108.0 Ops/sec
forEach	99.4 Ops/sec
map	103.4 Ops/sec
while	46.4 Ops/sec