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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0

Browser: Firefox 119

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
String.fromCharCode	1995921.2 Ops/sec
TextDecoder	2889698.5 Ops/sec
TextDecoder plus array	2558685.5 Ops/sec
TextDecoder plus constructor and array	1377696.8 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));

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

String.fromCharCode

TextDecoder

TextDecoder plus array

TextDecoder plus constructor and array