Run results for: for loop vs for loop w/ cached array length

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.4 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

cached inline

88K/s

cached

88K/s

hardcoded

87K/s

uncached

34K/s

View exact numbers

Script Preparation code:

"use strict";
const arr = [];
for (let i=0; i<1000; i++) arr.push(i);

Tests:

uncached
"use strict"; let _ = 0; for (let i=0; i<arr.length; i++){ _ = arr[i]; }
cached
"use strict"; const len = arr.length; let _ = 0; for (let i=0; i<len; i++){ _ = arr[i]; }
cached inline
"use strict"; let _ = 0; for (let len=arr.length, i=0; i<len; i++){ _ = arr[i]; }
hardcoded
"use strict"; let _ = 0; for (let i=0; i<1000; i++){ _ = arr[i]; }