Run results for: Caching length property vs getting it each time in the loop

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 9_3_5 like Mac OS X) AppleWebKit/601.1 (KHTML, like Gecko) CriOS/52.0.2743.84 Mobile/13G36 Safari/601.1.46

Browser:

Operating system:

Device Platform:

Date tested: 7 years ago

Test name	Executions per second
Cache length	6438.7 Ops/sec
Do not cache	3237.4 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]; }