Run results for: uint8array 8 extract vs uint8 10 extract

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.2.1

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

8 byte

1.3M/s

10 byte

1.2M/s

View exact numbers

Test name	Executions per second
✓ 8 byte	1,252,748 Ops/sec
10 byte	1,243,670 Ops/sec

Script Preparation code:


function generateRandomUint8Array(length) {
    const array = new Uint8Array(length);
    window.crypto.getRandomValues(array);
    return array;
}

function readInt64LE(bytes, offset) {
    return (bytes[offset] | (bytes[offset + 1] << 8) | (bytes[offset + 2] << 16) | (bytes[offset + 3] << 24) | (bytes[offset + 4] << 32) | (bytes[offset + 5] << 40)) >>> 0;
}

Tests:

10 byte
// Example usage: const bytes = generateRandomUint8Array(120); let sp = [] for (let i = 0; i < 8; ++i) { let id = readInt64LE(bytes, (i * 10) + 8); // imageset id [8] let imgIdx0 = bytes[(i * 10) + 16]; // image index 0 [9] let imgIdx1 = bytes[(i * 10) + 17]; // image index 1 [10] sp.push([id, imgIdx0, imgIdx1]) }
8 byte
// Example usage: const bytes = generateRandomUint8Array(120); let sp = [] for (let i = 0; i < 8; ++i) { let id = readInt64LE(bytes, (i << 3) + 8); // imageset id [6] let imgIdx0 = bytes[(i << 3) + 14]; // image index 0 [7] let imgIdx1 = bytes[(i << 3) + 15]; // image index 1 [8] sp.push([id, imgIdx0, imgIdx1]) }