Run results for: JS BigInt To Uint8Array

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0

Browser: Firefox 100

Operating system: Linux

Device Platform: Desktop

Date tested: 4 months ago

for-loop

4.8M/s

dataview

2.6M/s

View exact numbers

Test name	Executions per second
✓ for-loop	4,785,396 Ops/sec
dataview	2,624,675 Ops/sec

HTML Preparation code:

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

Script Preparation code:

function bigIntToBigEndianBytesLoop(value) {
    const hex = value.toString(16).padStart(8 * 2, '0');
    const bytes = new Uint8Array(8);
    for (let i = 0; i < 8; i++) {
        bytes[i] = parseInt(hex.slice(i * 2, i * 2 + 2), 16);
    }
    return bytes;
}

function bigIntToBigEndianBytesDataView(value) {
    const buf = new ArrayBuffer(8);
    const view = new DataView(buf);

    view.setBigUint64(0, value);
    return new Uint8Array(buf);
}

Tests:

for-loop
bigIntToBigEndianBytesLoop(2382975329865n);
dataview
bigIntToBigEndianBytesDataView(2382975329865n);