Run results for: Caching length property (internal and external) vs getting it each time in the loop, v2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.4.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Cache length (external)	1951.3 Ops/sec
No cache	843.5 Ops/sec
Cache length (internal)	1928.6 Ops/sec
Reverse loop, internal cache (var)	1911.3 Ops/sec
Reverse loop, internal cache (let)	1925.5 Ops/sec

Script Preparation code:

var arr = [];
var count = 10000;
for(var i = 0; i<count; i++)
{
  arr.push(i);
}

Tests:

Cache length (external)
var arrLen = arr.length; var sum = 0; for (var i = 0; i < arrLen; i++){ sum = arr[i]; }
No cache
var sum = 0; for (var i = 0; i < arr.length; i++){ sum = arr[i]; }
Cache length (internal)
var sum = 0; for (var i = 0, arrLen = arr.length; i < arrLen; i++){ sum = arr[i]; }
Reverse loop, internal cache (var)
var sum = 0; for (var i = arr.length; i--; ){ sum = arr[i]; }
Reverse loop, internal cache (let)
let sum = 0; for( let i = arr.length; i--; ){ sum = arr[i]; }