Run results for: JS BigInt To Uint8Array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

dataview

1.4M/s

for-loop

1.4M/s

View exact numbers

Test name	Executions per second
✓ dataview	1,443,380 Ops/sec
for-loop	1,402,724 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);