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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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Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.6.2
Device Platform:
Mobile
Date tested:
5 months ago
Test name
Executions per second
Cache length
3212032.8 Ops/sec
Do not cache
3226687.5 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]; }