Run results for: DataView vs Uint8Array by bytes write + read

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

DataView

17.2M/s

Uint8Array by byte

16.4M/s

Uint8Array with set

1.3M/s

View exact numbers

Test name	Executions per second
✓ DataView	17,248,316 Ops/sec
Uint8Array by byte	16,367,555 Ops/sec
Uint8Array with set	1,267,546 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]); } const results = [] for (let i; i < size; i++) { results.push(view.getUint8(i, data[i])); }
Uint8Array by byte
for (let i; i < size; i++) { byte[i] = data[i]; } const results = []; for (let i; i < size; i++) { results.push(byte[i]); }
Uint8Array with set
byte.set(data, 0);