Run results for: DataView vs Uint8Array by bytes vs Uint8Array set Uint8Array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.66 Safari/537.36

Browser: Chrome 103

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
DataView	13657330.0 Ops/sec
Uint8Array by byte	13575750.0 Ops/sec
Uint8Array with set	792209.8 Ops/sec
Uint8Array with set other Uint8Array	5871649.0 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();
}

var dataBytes = new Uint8Array(data);

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);
Uint8Array with set other Uint8Array
byte.set(dataBytes, 0);

Run results for: DataView vs Uint8Array by bytes vs Uint8Array set Uint8Array

DataView

Uint8Array by byte

Uint8Array with set

Uint8Array with set other Uint8Array