Run results for: TextDecoder vs String.fromCharCode vs Spread

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:120.0) Gecko/20100101 Firefox/120.0

Browser: Firefox 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

TextDecoder

4.7M/s

String.fromCharCode

3.2M/s

String.fromCharCode Spread

2.2M/s

View exact numbers

Test name	Executions per second
✓ TextDecoder	4,678,905 Ops/sec
String.fromCharCode	3,192,024 Ops/sec
String.fromCharCode Spread	2,224,370 Ops/sec

Script Preparation code:

var bytes = [84,104,105,115,32,105,115,32,97,32,115,97,109,112,108,101,32,112,97,114,97,103,114,97,112,104,46];
var bufferArray = new Uint16Array(bytes);
var decoder = new TextDecoder(); // default 'utf-8' or 'utf8'

Tests:

String.fromCharCode
String.fromCharCode.apply(null, bufferArray);
TextDecoder
decoder.decode(bufferArray);
String.fromCharCode Spread
String.fromCharCode(...bufferArray);