Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.6.1

Device Platform: Mobile

Date tested: 11 months ago

DataView

206.2M/s

Uint8Array by byte

205.0M/s

Uint8Array with set

1.6M/s

View exact numbers

Test name	Executions per second
✓ DataView	206,204,192 Ops/sec
Uint8Array by byte	205,003,584 Ops/sec
Uint8Array with set	1,611,371 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);