@polkadot/util/is/u8a.js

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0

/**
 * @name isU8a
 * @summary Tests for a `Uint8Array` object instance.
 * @description
 * Checks to see if the input object is an instance of `Uint8Array`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { isUint8Array } from '@polkadot/util';
 *
 * console.log('isU8a', isU8a([])); // => false
 * ```
 */
export function isU8a(value) {
  // here we defer the instanceof check which is actually slightly
  // slower than just checking the constrctor (direct instances)
  return (value && value.constructor) === Uint8Array || value instanceof Uint8Array;
}