Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.8 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.7.1

Device Platform: Mobile

Date tested: one year ago

DataView

205.4M/s

Uint8Array by byte

163.6M/s

Uint8Array with set

1.7M/s

View exact numbers

Test name	Executions per second
✓ DataView	205,378,800 Ops/sec
Uint8Array by byte	163,625,440 Ops/sec
Uint8Array with set	1,703,699 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);