71 lines
3.6 KiB
Plaintext
71 lines
3.6 KiB
Plaintext
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# typed-array-byte-offset <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][npm-badge-png]][package-url]
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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.
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## Example
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```js
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var typedArrayByteOffset = require('typed-array-byte-offset');
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var assert = require('assert');
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assert.equal(false, typedArrayByteOffset(undefined));
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assert.equal(false, typedArrayByteOffset(null));
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assert.equal(false, typedArrayByteOffset(false));
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assert.equal(false, typedArrayByteOffset(true));
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assert.equal(false, typedArrayByteOffset([]));
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assert.equal(false, typedArrayByteOffset({}));
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assert.equal(false, typedArrayByteOffset(/a/g));
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assert.equal(false, typedArrayByteOffset(new RegExp('a', 'g')));
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assert.equal(false, typedArrayByteOffset(new Date()));
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assert.equal(false, typedArrayByteOffset(42));
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assert.equal(false, typedArrayByteOffset(NaN));
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assert.equal(false, typedArrayByteOffset(Infinity));
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assert.equal(false, typedArrayByteOffset(new Number(42)));
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assert.equal(false, typedArrayByteOffset('foo'));
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assert.equal(false, typedArrayByteOffset(Object('foo')));
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assert.equal(false, typedArrayByteOffset(function () {}));
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assert.equal(false, typedArrayByteOffset(function* () {}));
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assert.equal(false, typedArrayByteOffset(x => x * x));
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assert.equal(false, typedArrayByteOffset([]));
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const buffer = new ArrayBuffer(32);
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assert.equal(8, typedArrayByteOffset(new Int8Array(buffer, 8)));
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assert.equal(8, typedArrayByteOffset(new Uint8Array(buffer, 8)));
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assert.equal(8, typedArrayByteOffset(new Uint8ClampedArray(buffer, 8)));
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assert.equal(4, typedArrayByteOffset(new Int16Array(buffer, 4)));
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assert.equal(4, typedArrayByteOffset(new Uint16Array(buffer, 4)));
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assert.equal(8, typedArrayByteOffset(new Int32Array(buffer, 8)));
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assert.equal(8, typedArrayByteOffset(new Uint32Array(buffer, 8)));
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assert.equal(16, typedArrayByteOffset(new Float32Array(buffer, 16)));
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assert.equal(16, typedArrayByteOffset(new Float64Array(buffer, 16)));
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assert.equal(16, typedArrayByteOffset(new BigInt64Array(buffer, 16)));
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assert.equal(16, typedArrayByteOffset(new BigUint64Array(buffer, 16)));
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[package-url]: https://npmjs.org/package/typed-array-byte-offset
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[npm-version-svg]: https://versionbadg.es/inspect-js/typed-array-byte-offset.svg
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[deps-svg]: https://david-dm.org/inspect-js/typed-array-byte-offset.svg
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[deps-url]: https://david-dm.org/inspect-js/typed-array-byte-offset
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[dev-deps-svg]: https://david-dm.org/inspect-js/typed-array-byte-offset/dev-status.svg
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[dev-deps-url]: https://david-dm.org/inspect-js/typed-array-byte-offset#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/typed-array-byte-offset.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/typed-array-byte-offset.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/typed-array-byte-offset.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=typed-array-byte-offset
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[codecov-image]: https://codecov.io/gh/inspect-js/typed-array-byte-offset/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/inspect-js/typed-array-byte-offset/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/typed-array-byte-offset
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[actions-url]: https://github.com/inspect-js/typed-array-byte-offset/actions
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