Run results for: TextDecoder vs String.fromCharCode/escape/decodeURIComponent

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

TextDecoder

7.1M/s

decodeURIComponent/apply

2.0M/s

decodeURIComponent/spread

765K/s

View exact numbers

Test name	Executions per second
✓ TextDecoder	7,055,052 Ops/sec
decodeURIComponent/apply	1,964,176 Ops/sec
decodeURIComponent/spread	764,633 Ops/sec

Script Preparation code:

data = new Uint8Array([
  208, 158, 208, 177, 208, 188, 208, 176, 208, 189, 209,
  131, 209, 130, 209, 139, 208, 185, 32, 47, 32, 84, 104,
  101, 32, 66, 101, 103, 117, 105, 108, 101, 100, 32, 40,
  49, 57, 55, 49, 41, 32, 66, 68, 82, 105, 112
]);

utf8decoder = new TextDecoder('utf-8', { fatal: true })

Tests:

decodeURIComponent/apply
const result = decodeURIComponent(escape(String.fromCharCode.apply(0, data)));
decodeURIComponent/spread
const result = decodeURIComponent(escape(String.fromCharCode(...data)));
TextDecoder
const result = utf8decoder.decode(data)