Run results for: TextDecoder 'ascii' vs String.fromCharCode

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

TextDecoder

3.0M/s

String.fromCharCode

2.7M/s

View exact numbers

Test name	Executions per second
✓ TextDecoder	2,971,713 Ops/sec
String.fromCharCode	2,679,384 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('ascii'); // default 'utf-8' or 'utf8'

Tests:

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