https://github.com/inspect-js/typed-array-byte-length
Get the byte length of a Typed Array, even in engines without a `.byteLength` method.
https://github.com/inspect-js/typed-array-byte-length
array bytelength typed typed-array
Last synced: 3 months ago
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Get the byte length of a Typed Array, even in engines without a `.byteLength` method.
- Host: GitHub
- URL: https://github.com/inspect-js/typed-array-byte-length
- Owner: inspect-js
- License: mit
- Created: 2023-07-14T04:13:35.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2024-12-17T22:33:10.000Z (6 months ago)
- Last Synced: 2025-03-31T17:08:35.295Z (3 months ago)
- Topics: array, bytelength, typed, typed-array
- Language: JavaScript
- Homepage:
- Size: 40 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
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README
# typed-array-byte-offset [![Version Badge][npm-version-svg]][package-url]
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[![npm badge][npm-badge-png]][package-url]
Robustly get the byte offset of a Typed Array, or `false` if it is not a Typed Array. Works cross-realm, in every engine, even if the `byteOffset` property is overridden.
## Example
```js
var typedArrayByteOffset = require('typed-array-byte-offset');
var assert = require('assert');
assert.equal(false, typedArrayByteOffset(undefined));
assert.equal(false, typedArrayByteOffset(null));
assert.equal(false, typedArrayByteOffset(false));
assert.equal(false, typedArrayByteOffset(true));
assert.equal(false, typedArrayByteOffset([]));
assert.equal(false, typedArrayByteOffset({}));
assert.equal(false, typedArrayByteOffset(/a/g));
assert.equal(false, typedArrayByteOffset(new RegExp('a', 'g')));
assert.equal(false, typedArrayByteOffset(new Date()));
assert.equal(false, typedArrayByteOffset(42));
assert.equal(false, typedArrayByteOffset(NaN));
assert.equal(false, typedArrayByteOffset(Infinity));
assert.equal(false, typedArrayByteOffset(new Number(42)));
assert.equal(false, typedArrayByteOffset('foo'));
assert.equal(false, typedArrayByteOffset(Object('foo')));
assert.equal(false, typedArrayByteOffset(function () {}));
assert.equal(false, typedArrayByteOffset(function* () {}));
assert.equal(false, typedArrayByteOffset(x => x * x));
assert.equal(false, typedArrayByteOffset([]));
const buffer = new ArrayBuffer(32);
assert.equal(8, typedArrayByteOffset(new Int8Array(buffer, 8)));
assert.equal(8, typedArrayByteOffset(new Uint8Array(buffer, 8)));
assert.equal(8, typedArrayByteOffset(new Uint8ClampedArray(buffer, 8)));
assert.equal(4, typedArrayByteOffset(new Int16Array(buffer, 4)));
assert.equal(4, typedArrayByteOffset(new Uint16Array(buffer, 4)));
assert.equal(8, typedArrayByteOffset(new Int32Array(buffer, 8)));
assert.equal(8, typedArrayByteOffset(new Uint32Array(buffer, 8)));
assert.equal(16, typedArrayByteOffset(new Float32Array(buffer, 16)));
assert.equal(16, typedArrayByteOffset(new Float64Array(buffer, 16)));
assert.equal(16, typedArrayByteOffset(new BigInt64Array(buffer, 16)));
assert.equal(16, typedArrayByteOffset(new BigUint64Array(buffer, 16)));
```
## Tests
Simply clone the repo, `npm install`, and run `npm test`
[package-url]: https://npmjs.org/package/typed-array-byte-offset
[npm-version-svg]: https://versionbadg.es/inspect-js/typed-array-byte-offset.svg
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[dev-deps-url]: https://david-dm.org/inspect-js/typed-array-byte-offset#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/typed-array-byte-offset.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/typed-array-byte-offset.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/typed-array-byte-offset.svg
[downloads-url]: https://npm-stat.com/charts.html?package=typed-array-byte-offset
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