| 1 | # typed-array-length <sup>[![Version Badge][2]][1]</sup>
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| 2 |
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| 3 | [![dependency status][5]][6]
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| 4 | [![dev dependency status][7]][8]
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| 5 | [![License][license-image]][license-url]
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| 6 | [![Downloads][downloads-image]][downloads-url]
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| 7 |
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| 8 | [![npm badge][11]][1]
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| 9 |
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| 10 | Robustly get the length of a Typed Array, or `false` if it is not a Typed Array. Works cross-realm, in every engine, even if the `length` property is overridden.
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| 11 |
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| 12 | ## Example
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| 13 |
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| 14 | ```js
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| 15 | var typedArrayLength = require('typed-array-length');
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| 16 | var assert = require('assert');
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| 17 |
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| 18 | assert.equal(false, typedArrayLength(undefined));
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| 19 | assert.equal(false, typedArrayLength(null));
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| 20 | assert.equal(false, typedArrayLength(false));
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| 21 | assert.equal(false, typedArrayLength(true));
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| 22 | assert.equal(false, typedArrayLength([]));
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| 23 | assert.equal(false, typedArrayLength({}));
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| 24 | assert.equal(false, typedArrayLength(/a/g));
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| 25 | assert.equal(false, typedArrayLength(new RegExp('a', 'g')));
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| 26 | assert.equal(false, typedArrayLength(new Date()));
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| 27 | assert.equal(false, typedArrayLength(42));
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| 28 | assert.equal(false, typedArrayLength(NaN));
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| 29 | assert.equal(false, typedArrayLength(Infinity));
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| 30 | assert.equal(false, typedArrayLength(new Number(42)));
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| 31 | assert.equal(false, typedArrayLength('foo'));
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| 32 | assert.equal(false, typedArrayLength(Object('foo')));
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| 33 | assert.equal(false, typedArrayLength(function () {}));
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| 34 | assert.equal(false, typedArrayLength(function* () {}));
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| 35 | assert.equal(false, typedArrayLength(x => x * x));
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| 36 | assert.equal(false, typedArrayLength([]));
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| 37 |
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| 38 | assert.equal(1, typedArrayLength(new Int8Array(1)));
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| 39 | assert.equal(2, typedArrayLength(new Uint8Array(2)));
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| 40 | assert.equal(3, typedArrayLength(new Uint8ClampedArray(3)));
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| 41 | assert.equal(4, typedArrayLength(new Int16Array(4)));
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| 42 | assert.equal(5, typedArrayLength(new Uint16Array(5)));
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| 43 | assert.equal(6, typedArrayLength(new Int32Array(6)));
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| 44 | assert.equal(7, typedArrayLength(new Uint32Array(7)));
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| 45 | assert.equal(8, typedArrayLength(new Float32Array(8)));
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| 46 | assert.equal(9, typedArrayLength(new Float64Array(9)));
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| 47 | assert.equal(10, typedArrayLength(new BigInt64Array(10)));
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| 48 | assert.equal(11, typedArrayLength(new BigUint64Array(11)));
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| 49 | ```
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| 50 |
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| 51 | ## Tests
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| 52 | Simply clone the repo, `npm install`, and run `npm test`
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| 53 |
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| 54 | [1]: https://npmjs.org/package/typed-array-length
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| 55 | [2]: https://versionbadg.es/inspect-js/typed-array-length.svg
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| 56 | [5]: https://david-dm.org/inspect-js/typed-array-length.svg
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| 57 | [6]: https://david-dm.org/inspect-js/typed-array-length
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| 58 | [7]: https://david-dm.org/inspect-js/typed-array-length/dev-status.svg
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| 59 | [8]: https://david-dm.org/inspect-js/typed-array-length#info=devDependencies
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| 60 | [11]: https://nodei.co/npm/typed-array-length.png?downloads=true&stars=true
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| 61 | [license-image]: http://img.shields.io/npm/l/typed-array-length.svg
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| 62 | [license-url]: LICENSE
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| 63 | [downloads-image]: http://img.shields.io/npm/dm/typed-array-length.svg
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| 64 | [downloads-url]: http://npm-stat.com/charts.html?package=typed-array-length
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