Run results for: JavaScript Uint8Array to Base64: btoa vs btoa spread

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

btoa 1K

86K/s

btoa spread 1K

47K/s

btoa 32K

3K/s

btoa spread 32K

2K/s

btoa 64K

1K/s

btoa spread 64K

909/s

btoa 1M

49/s

View exact numbers

Test name	Executions per second
✓ btoa 1K	86,444 Ops/sec
btoa spread 1K	47,272 Ops/sec
btoa 32K	2,797 Ops/sec
btoa spread 32K	1,696 Ops/sec
btoa 64K	1,357 Ops/sec
btoa spread 64K	909 Ops/sec
btoa 1M	49 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

function bytesToBase64ByBtoa(bytes) {
    return btoa(bytes.reduce((data, byte) => data + String.fromCharCode(byte), ""));
}

function bytesToBase64ByBtoaSpread(bytes) {
    return btoa(String.fromCharCode(...bytes));
}

const bytes1K = new Uint8Array(1024);
const bytes32K = new Uint8Array(32768);
const bytes64K = new Uint8Array(65536);
const bytes1M = new Uint8Array(1048576);
for (const bytes of [bytes1K, bytes32K, bytes64K, bytes1M])
    for (let i = 0; i < bytes.length; i += 65536)
        crypto.getRandomValues(bytes.subarray(i, i + 65536));

Tests:

btoa 1K
bytesToBase64ByBtoa(bytes1K);
btoa 32K
bytesToBase64ByBtoa(bytes32K);
btoa 64K
bytesToBase64ByBtoa(bytes64K);
btoa 1M
bytesToBase64ByBtoa(bytes1M);
btoa spread 1K
bytesToBase64ByBtoaSpread(bytes1K);
btoa spread 32K
bytesToBase64ByBtoaSpread(bytes32K);
btoa spread 64K
bytesToBase64ByBtoaSpread(bytes64K);