Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/119.0.6045.169 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 119

Operating system: iOS 16.6

Device Platform: Mobile

Date tested: one year ago

Uint8Array by byte

13.3M/s

DataView

12.6M/s

Uint8Array with set

227K/s

View exact numbers

Test name	Executions per second
✓ Uint8Array by byte	13,315,504 Ops/sec
DataView	12,630,252 Ops/sec
Uint8Array with set	227,047 Ops/sec

Script Preparation code:

var size = 0xFF;
var buf = new ArrayBuffer(size);
var view = new DataView(buf);
var byte = new Uint8Array(buf);

var data = [];

for (let i = 0; i < size; i++) {
	data[i] = 100*Math.random();
}

Tests:

DataView
for (let i; i < size; i++) { view.setUint8(i, data[i]); }
Uint8Array by byte
for (let i; i < size; i++) { byte[i] = data[i]; }
Uint8Array with set
byte.set(data, 0);