Run results for: UInt8Array vs cast to array index access 10k

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36

Browser: Chrome 93

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Uint8Array index	69101.3 Ops/sec
Array.from array index	2463.1 Ops/sec

Script Preparation code:

let arr = [];
for (let i = 0; i < 10000; i++)
    arr.push(i % 256);

var u8a = new Uint8Array(arr);

Tests:

Uint8Array index
const a = u8a; //(u8a as unknown) as number[]; const al = a.length; let s = 0; for(let i=0; i<al; i++) s += a[i];
Array.from array index
const a = Array.from(u8a); const al = a.length; let s = 0; for(let i=0; i<al; i++) s += a[i];