Run results for: TextDecoder vs String.fromCharCode

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_3 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) CriOS/64.0.3282.112 Mobile/14G60 Safari/602.1

Browser: Chrome Mobile iOS 64

Operating system: iOS 10.3.3

Device Platform: Mobile

Date tested: 2 years ago

TextDecoder

2.1M/s

String.fromCharCode

1.3M/s

View exact numbers

Test name	Executions per second
✓ TextDecoder	2,108,282 Ops/sec
String.fromCharCode	1,268,360 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);