Run results for: Array: [] vs at() last index

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Script Preparation code:

var size = 0xffffff;
var data = Array.from({length: size}, (_, index) => index);

Tests:

Array[] array.length - 1
let sum = 0; for (let i; i < size; i++) { sum += data[array.length - 1]; }
Array.at() -1
let sum = 0; for (let i; i < size; i++) { sum += data.at(-1); }
Array[] cached array.length - 1
let sum = 0; let length = data.length; for (let i; i < size; i++) { sum += data[length -1]; }