Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:122.0) Gecko/122.0 Firefox/122.0

Browser: Firefox Mobile 122

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Uint8Array by byte

940.4M/s

DataView

939.2M/s

Uint8Array with set

1.0M/s

View exact numbers

Test name	Executions per second
✓ Uint8Array by byte	940,361,984 Ops/sec
DataView	939,242,496 Ops/sec
Uint8Array with set	1,000,356 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);