Run results for: Convert bytes to binary string

To use browser's atob() or btoa(), we need to convert between bytes and so-called "binary" string. This test convert bytes to "binary" string, for future calls of btoa(), i.e. encoding bytes (in the form of binary string) to base64.

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 126

Operating system: Android

Device Platform: Mobile

Date tested: 16 days ago

Test name	Executions per second
Array.from + join + fromCodePoint	47.0 Ops/sec
Array.from + join + fromCharCode	43.7 Ops/sec
Array.reduce + fromCodePoint	62.6 Ops/sec
Array.reduce + fromCharCode	62.9 Ops/sec
String concatenation + fromCodePoint	58.2 Ops/sec
String concatenation + fromCharCode	60.0 Ops/sec
Function.apply + Array.reduce+ fromCodePoint (chunked)	553.7 Ops/sec
Function.apply + Array.reduce + fromCharCode (chunked)	950.6 Ops/sec
Function.apply + String concatenation + fromCodePoint (chunked)	517.6 Ops/sec
Function.apply + String concatenation + fromCharCode (chunked)	868.5 Ops/sec
Function.apply + Array.reduce+ fromCodePoint (small chunks)	399.1 Ops/sec
Function.apply + Array.reduce + fromCharCode (small chunks)	543.9 Ops/sec
Function.apply + String concatenation + fromCodePoint (small chunks)	372.8 Ops/sec
Function.apply + String concatenation + fromCharCode (small chunks)	542.3 Ops/sec
utf-16 TextDecoder	1745.5 Ops/sec

Script Preparation code:

function get1024Bytes(n) {
  const bytes = new Uint8Array(n * 1024);
  for (let i = 0; i < bytes.length; i += 1) {
    bytes[i] = Math.random() * 0xff;
  }
  return bytes;
}

const bytes = get1024Bytes(128);

const utf16decoder = new TextDecoder('utf-16');

// An example result:
// const binString = Array.from(bytes, (byte) => String.fromCodePoint(byte)).join("");

Tests:

Array.from + join + fromCodePoint
return Array.from(bytes, (byte) => String.fromCodePoint(byte), ).join("");
Array.from + join + fromCharCode
return Array.from(bytes, (byte) => String.fromCharCode(byte), ).join("");
Array.reduce + fromCodePoint
return bytes.reduce((s, byte) => s + String.fromCodePoint(byte), "");
Array.reduce + fromCharCode
return bytes.reduce((s, byte) => s + String.fromCharCode(byte), "");
String concatenation + fromCodePoint
let s = ''; for (const byte of bytes) { s += String.fromCodePoint(byte); } return s;
String concatenation + fromCharCode
let s = ''; for (const byte of bytes) { s += String.fromCharCode(byte); } return s;
Function.apply + Array.reduce+ fromCodePoint (chunked)
const QUANTUM = 32768; const chunks = []; for (let i = 0; i < bytes.length; i += QUANTUM) { chunks.push(bytes.slice(i, i + QUANTUM)); } return chunks.reduce((s, i) => s + String.fromCodePoint.apply(null, i), '');
Function.apply + Array.reduce + fromCharCode (chunked)
const QUANTUM = 32768; const chunks = []; for (let i = 0; i < bytes.length; i += QUANTUM) { chunks.push(bytes.slice(i, i + QUANTUM)); } return chunks.reduce((s, i) => s + String.fromCharCode.apply(null, i), '');
Function.apply + String concatenation + fromCodePoint (chunked)
const QUANTUM = 32768; let s = ''; for (let i = 0; i < bytes.length; i += QUANTUM) { s += String.fromCodePoint.apply(null, bytes.slice(i, i + QUANTUM)); } return s;
Function.apply + String concatenation + fromCharCode (chunked)
const QUANTUM = 32768; let s = ''; for (let i = 0; i < bytes.length; i += QUANTUM) { s += String.fromCharCode.apply(null, bytes.slice(i, i + QUANTUM)); } return s;
Function.apply + Array.reduce+ fromCodePoint (small chunks)
const QUANTUM = 128; const chunks = []; for (let i = 0; i < bytes.length; i += QUANTUM) { chunks.push(bytes.slice(i, i + QUANTUM)); } return chunks.reduce((s, i) => s + String.fromCodePoint.apply(null, i), '');
Function.apply + Array.reduce + fromCharCode (small chunks)
const QUANTUM = 128; const chunks = []; for (let i = 0; i < bytes.length; i += QUANTUM) { chunks.push(bytes.slice(i, i + QUANTUM)); } return chunks.reduce((s, i) => s + String.fromCharCode.apply(null, i), '');
Function.apply + String concatenation + fromCodePoint (small chunks)
const QUANTUM = 128; let s = ''; for (let i = 0; i < bytes.length; i += QUANTUM) { s += String.fromCodePoint.apply(null, bytes.slice(i, i + QUANTUM)); } return s;
Function.apply + String concatenation + fromCharCode (small chunks)
const QUANTUM = 128; let s = ''; for (let i = 0; i < bytes.length; i += QUANTUM) { s += String.fromCharCode.apply(null, bytes.slice(i, i + QUANTUM)); } return s;
utf-16 TextDecoder
return utf16decoder.decode(new Uint16Array(bytes));

Run results for: Convert bytes to binary string

To use browser's atob() or btoa(), we need to convert between bytes and so-called "binary" string. This test convert bytes to "binary" string, for future calls of btoa(), i.e. encoding bytes (in the form of binary string) to base64.

Array.from + join + fromCodePoint

Array.from + join + fromCharCode

Array.reduce + fromCodePoint

Array.reduce + fromCharCode

String concatenation + fromCodePoint

String concatenation + fromCharCode

Function.apply + Array.reduce+ fromCodePoint (chunked)

Function.apply + Array.reduce + fromCharCode (chunked)

Function.apply + String concatenation + fromCodePoint (chunked)

Function.apply + String concatenation + fromCharCode (chunked)

Function.apply + Array.reduce+ fromCodePoint (small chunks)

Function.apply + Array.reduce + fromCharCode (small chunks)

Function.apply + String concatenation + fromCodePoint (small chunks)

Function.apply + String concatenation + fromCharCode (small chunks)

utf-16 TextDecoder