For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /reference/predicate/isArrayBuffer.md.
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    isArrayBuffer es-toolkit

    Checks if a value is an ArrayBuffer instance.

    const result = isArrayBuffer(value);

    Usage

    isArrayBuffer(value)

    Use isArrayBuffer when you want to check if a value is an ArrayBuffer. It can also be used as a type guard in TypeScript.

    import { isArrayBuffer } from 'es-toolkit/predicate';

// Checking ArrayBuffer instances
const buffer = new ArrayBuffer(16);
const notBuffer = new Array(16);

console.log(isArrayBuffer(buffer)); // true
console.log(isArrayBuffer(notBuffer)); // false

// Useful when processing binary data
const data: unknown = getDataFromAPI();
if (isArrayBuffer(data)) {
  // In TypeScript, data is narrowed to ArrayBuffer
  const uint8View = new Uint8Array(data);
  console.log(`Buffer size: ${data.byteLength} bytes`);
}

// Comparison with various types
console.log(isArrayBuffer(new ArrayBuffer(8))); // true
console.log(isArrayBuffer(new Uint8Array(8))); // false
console.log(isArrayBuffer(new DataView(new ArrayBuffer(8)))); // false
console.log(isArrayBuffer([])); // false
console.log(isArrayBuffer({})); // false
console.log(isArrayBuffer(null)); // false
console.log(isArrayBuffer(undefined)); // false

    Frequently used in file processing and network communication.

    import { isArrayBuffer } from 'es-toolkit/predicate';

// Processing file read results
async function processFileData(file: File) {
  const result = await file.arrayBuffer();

  if (isArrayBuffer(result)) {
    console.log(`File size: ${result.byteLength} bytes`);

    // Process binary data
    const view = new DataView(result);
    const header = view.getUint32(0, true);
    console.log(`File header: ${header.toString(16)}`);
  }
}

// Checking data received from WebSocket
function handleWebSocketMessage(data: unknown) {
  if (isArrayBuffer(data)) {
    console.log('Received binary message');
    const bytes = new Uint8Array(data);
    // Process byte data
  } else if (typeof data === 'string') {
    console.log('Received text message');
    // Process string data
  }
}

    Parameters

    valueunknownrequired

    The value to check if it's an ArrayBuffer.

    Returns

    Returns true if the value is an ArrayBuffer, false otherwise.

    value is ArrayBuffer
    Source: es-toolkit

    Re-exported verbatim from es-toolkit. Implementation, edge cases, and performance behavior are owned upstream. This page mirrors the documentation at the pinned version; the linked source is authoritative.