Run results for: TextDecoder plus array initialization vs String.fromCharCode

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:148.0) Gecko/148.0 Firefox/148.0

Browser: Firefox Mobile 148

Operating system: Android

Device Platform: Mobile

Date tested: 4 months ago

TextDecoder

3.6M/s

String.fromCharCode

2.5M/s

TextDecoder plus array

2.3M/s

TextDecoder plus constructor and array

965K/s

View exact numbers

Test name	Executions per second
✓ TextDecoder	3,649,601 Ops/sec
String.fromCharCode	2,471,663 Ops/sec
TextDecoder plus array	2,281,511 Ops/sec
TextDecoder plus constructor and array	965,159 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);
TextDecoder plus array
decoder.decode(new Uint8Array(bytes));
TextDecoder plus constructor and array
new TextDecoder().decode(new Uint8Array(bytes));