Run results for: DataView vs Uint8Array by bytes

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.4

Device Platform: Mobile

Date tested: 28 days ago

Test name	Executions per second
DataView	759847680.0 Ops/sec
Uint8Array by byte	776468032.0 Ops/sec
Uint8Array with set	5561306.5 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();
}

​x
 
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]);
}

 
for (let i; i < size; i++) {    view.setUint8(i, data[i]);}

Uint8Array by byte
for (let i; i < size; i++) { byte[i] = data[i]; }
for (let i; i < size; i++) {
byte[i] = data[i];
}
Uint8Array with set
byte.set(data, 0);
byte.set(data, 0);

Run results for: DataView vs Uint8Array by bytes

DataView

Uint8Array by byte

Uint8Array with set