# typed-array-byte-offset ^{[![Version Badge][npm-version-svg]][package-url]} [![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url] [![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 [deps-svg]: https://david-dm.org/inspect-js/typed-array-byte-offset.svg [deps-url]: https://david-dm.org/inspect-js/typed-array-byte-offset [dev-deps-svg]: https://david-dm.org/inspect-js/typed-array-byte-offset/dev-status.svg [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 [codecov-image]: https://codecov.io/gh/inspect-js/typed-array-byte-offset/branch/main/graphs/badge.svg [codecov-url]: https://app.codecov.io/gh/inspect-js/typed-array-byte-offset/ [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/typed-array-byte-offset [actions-url]: https://github.com/inspect-js/typed-array-byte-offset/actions