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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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<iframe src="https://measurethat.net/Embed?id=522766" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36
Browser:
Chrome 124
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Cache length
30915.1 Ops/sec
Do not cache
15523.3 Ops/sec
Script Preparation code:
var arr = []; var count = 1000; 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]; }