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Run results for:
Caching length property vs getting it each time in the loop 22
save length of the array in the variable vs get it the loop
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<iframe src="https://measurethat.net/Embed?id=488608" 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/119.0.0.0 Safari/537.36
Browser:
Chrome 119
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
forEach
689K/s
Cache length
30K/s
Do not cache
16K/s
View exact numbers
Test name
Executions per second
✓
forEach
689,371 Ops/sec
Cache length
29,977 Ops/sec
Do not cache
15,967 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]; }
forEach
var sum = 0; arr.forEach(item => { sum += item })