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Convert binary string to bytes
To use browser's atob() or btoa(), we need to convert between bytes and so-called "binary" string. This test converts "binary" string to bytes, for working with results from atob() calls, which decodes base64 to bytes (in the form of binary string).
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<iframe src="https://measurethat.net/Embed?id=567779" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36
Browser:
Chrome 133
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Uint8Array.from + codePointAt
13.0 Ops/sec
Uint8Array.from + charCodeAt
13.2 Ops/sec
for-loop + codePointAt
9.9 Ops/sec
for-loop + charCodeAt
7.2 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(1024); /* Note that Function.prototype.apply() has a limit, so not using it to creat binary string here for convenience. To use it, split the array into smaller chunks first. String.fromCodePoint.apply(null, bytes); // bytes.length should not exceed the maximum See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply */ const binString = Array.from(bytes, (byte) => String.fromCodePoint(byte)).join("");
Tests:
Uint8Array.from + codePointAt
return Uint8Array.from(binString, (m) => m.codePointAt(0));
Uint8Array.from + charCodeAt
return Uint8Array.from(binString, (m) => m.charCodeAt(0));
for-loop + codePointAt
const bytes = new Uint8Array(binString.length); for (let i = 0; i < bytes.length; i += 1) { bytes[i] = binString[i].codePointAt(0); } return bytes;
for-loop + charCodeAt
const bytes = new Uint8Array(binString.length); for (let i = 0; i < bytes.length; i += 1) { bytes[i] = binString[i].charCodeAt(0); } return bytes;
for-loop + Uint8Array.from + codePointAt (small chunk)
const QUANTUM = 128; const bytes = new Uint8Array(binString.length); for (let i = 0; i < binString.length; i += QUANTUM) { let j = i; for (const b of Uint8Array.from(binString.slice(i, i + QUANTUM), (m) => m.codePointAt(0))) { bytes[j] = b; j += 1; } } return bytes;
for-loop + Uint8Array.from + charCodeAt (small chunk)
const QUANTUM = 128; const bytes = new Uint8Array(binString.length); for (let i = 0; i < binString.length; i += QUANTUM) { let j = i; for (const b of Uint8Array.from(binString.slice(i, i + QUANTUM), (m) => m.charCodeAt(0))) { bytes[j] = b; j += 1; } } return bytes;
for-loop + Uint8Array.from + codePointAt (big chunk)
const QUANTUM = 32768; const bytes = new Uint8Array(binString.length); for (let i = 0; i < binString.length; i += QUANTUM) { let j = i; for (const b of Uint8Array.from(binString.slice(i, i + QUANTUM), (m) => m.codePointAt(0))) { bytes[j] = b; j += 1; } } return bytes;
for-loop + Uint8Array.from + charCodeAt (big chunk)
const QUANTUM = 32768; const bytes = new Uint8Array(binString.length); for (let i = 0; i < binString.length; i += QUANTUM) { let j = i; for (const b of Uint8Array.from(binString.slice(i, i + QUANTUM), (m) => m.charCodeAt(0))) { bytes[j] = b; j += 1; } } return bytes;