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

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; SM-G920V Build/MMB29K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/52.0.2743.98 Mobile Safari/537.36

Browser: Chrome Mobile 52

Operating system: Android 6.0.1

Device Platform: Samsung SM-G920V

Date tested: 7 years ago

Test name	Executions per second
Cache length	4166.5 Ops/sec
Do not cache	2171.1 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]; }

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

Cache length

Do not cache