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Run results for:
Caching length property vs getting it each time in the loop
save length of the array in the variable vs get it the loop
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=596712" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0
Browser:
Firefox 136
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Do not cache
22K/s
Cache length
22K/s
Reverse
19K/s
Reverse Opt
19K/s
View exact numbers
Test name
Executions per second
✓
Do not cache
22,464 Ops/sec
Cache length
22,095 Ops/sec
Reverse
18,907 Ops/sec
Reverse Opt
18,872 Ops/sec
Script Preparation code:
var arr = []; var count = 25000; for(var i = 0; i<count; i++) { arr.push(i); }
Tests:
Cache length
var arrLen = arr.length; var sum = 0; for (var i = 0; i < arrLen; i++){ sum = arr[i]; }
Do not cache
var sum = 0; for (var i = 0; i < arr.length; i++){ sum = arr[i]; }
Reverse
var arrLen = arr.length; var sum = 0; for (var i = arrLen; i !== 0; i--){ sum = arr[i]; }
Reverse Opt
var arrLen = arr.length; var sum = 0; var base = 0; for (; base !== arrLen; base++){ sum = arr[base]; }