Run results for: Uint32Array copy vs set

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
set	3076388.0 Ops/sec
copy	3122404.2 Ops/sec

Script Preparation code:

var command = Math.floor(Math.random() * 65536),
    operation = Math.floor(Math.random() * 65536),
    cellId = Math.floor(Math.random() * 60),
    buffer = new Uint8Array(Array.from({
        length: Math.floor(Math.random() * 100)
    }).map(() => Math.floor(Math.random() * 256))).buffer,
    reverse = [0, 3],
    HEADER_SIZE = 8,
    MSG_HEADER_LEN = 32;

Tests:

set
const dataLength = buffer.byteLength; const content = new ArrayBuffer(MSG_HEADER_LEN + dataLength); const contentView = new Uint32Array(content, 0, HEADER_SIZE); if (dataLength) { const srcBuffer = new Uint8Array(buffer); const dstBuffer = new Uint8Array(content); dstBuffer.set(srcBuffer, MSG_HEADER_LEN); }
copy
const dataLength = buffer.byteLength; const content = new ArrayBuffer(MSG_HEADER_LEN + dataLength); const contentView = new Uint32Array(content, 0, HEADER_SIZE); if (dataLength) { const srcBuffer = new Uint8Array(buffer); const dstBuffer = new Uint8Array(content, MSG_HEADER_LEN, dataLength); for (let index = 0; index < dataLength; index++) { dstBuffer[index] = srcBuffer[index]; } }