Run results for: unescape vs TextEncoder vs FileReader v3

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
TextEncoder small (14 chars)	1272561.5 Ops/sec
unescape small (14 chars)	1048191.2 Ops/sec
FileReader small (14 chars)	123651.6 Ops/sec
TextEncoder large (30,000 chars)	157.6 Ops/sec
unescape large (30,000 chars)	600.9 Ops/sec
FileReader large (30,000 chars)	3544.8 Ops/sec

Script Preparation code:

var unicodeString = "가나다라마바사아자차카타파하";
var unicodeString_large = "".padStart(30000, unicodeString);
var textEncoder = new TextEncoder();

const PREFIX_STR = "data:text/plain;base64,";

function toBase64FileReader( text ) {
  return new Promise( (resolve, reject) => {
    const reader = new FileReader();
    
    // data:text/plain;base64,...
    reader.onload = () => resolve(reader.result.substr(PREFIX_STR.length));
    reader.onerror = (err) => reject(err);
    
    reader.readAsDataURL(
      new Blob([ new TextEncoder().encode( text ) ], { type: "text/plain" })
    );
  });
}

function toBase64TextEcnder( text ) {
  return btoa( String.fromCharCode(...textEncoder.encode(text)));
}

function toBase64Unscape( text ) {
  return btoa(unescape(encodeURIComponent(text)));
}

Tests:

TextEncoder small (14 chars)
toBase64TextEcnder(unicodeString);
unescape small (14 chars)
toBase64Unscape(unicodeString);
FileReader small (14 chars)
toBase64FileReader(unicodeString);
TextEncoder large (30,000 chars)
toBase64TextEcnder(unicodeString_large);
unescape large (30,000 chars)
toBase64Unscape(unicodeString_large);
FileReader large (30,000 chars)
toBase64FileReader(unicodeString_large);

Run results for: unescape vs TextEncoder vs FileReader v3

TextEncoder small (14 chars)

unescape small (14 chars)

FileReader small (14 chars)

TextEncoder large (30,000 chars)

unescape large (30,000 chars)

FileReader large (30,000 chars)