Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0

Browser: Firefox 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Uint8Array by byte

756.9M/s

DataView

696.0M/s

Uint8Array with set

422K/s

View exact numbers

Test name	Executions per second
✓ Uint8Array by byte	756,928,576 Ops/sec
DataView	696,003,392 Ops/sec
Uint8Array with set	422,246 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);