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  1. # typed-array-length <sup>[![Version Badge][2]][1]</sup>
  2. [![dependency status][5]][6]
  3. [![dev dependency status][7]][8]
  4. [![License][license-image]][license-url]
  5. [![Downloads][downloads-image]][downloads-url]
  6. [![npm badge][11]][1]
  7. 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.
  8. ## Example
  9. ```js
  10. var typedArrayLength = require('typed-array-length');
  11. var assert = require('assert');
  12. assert.equal(false, typedArrayLength(undefined));
  13. assert.equal(false, typedArrayLength(null));
  14. assert.equal(false, typedArrayLength(false));
  15. assert.equal(false, typedArrayLength(true));
  16. assert.equal(false, typedArrayLength([]));
  17. assert.equal(false, typedArrayLength({}));
  18. assert.equal(false, typedArrayLength(/a/g));
  19. assert.equal(false, typedArrayLength(new RegExp('a', 'g')));
  20. assert.equal(false, typedArrayLength(new Date()));
  21. assert.equal(false, typedArrayLength(42));
  22. assert.equal(false, typedArrayLength(NaN));
  23. assert.equal(false, typedArrayLength(Infinity));
  24. assert.equal(false, typedArrayLength(new Number(42)));
  25. assert.equal(false, typedArrayLength('foo'));
  26. assert.equal(false, typedArrayLength(Object('foo')));
  27. assert.equal(false, typedArrayLength(function () {}));
  28. assert.equal(false, typedArrayLength(function* () {}));
  29. assert.equal(false, typedArrayLength(x => x * x));
  30. assert.equal(false, typedArrayLength([]));
  31. assert.equal(1, typedArrayLength(new Int8Array(1)));
  32. assert.equal(2, typedArrayLength(new Uint8Array(2)));
  33. assert.equal(3, typedArrayLength(new Uint8ClampedArray(3)));
  34. assert.equal(4, typedArrayLength(new Int16Array(4)));
  35. assert.equal(5, typedArrayLength(new Uint16Array(5)));
  36. assert.equal(6, typedArrayLength(new Int32Array(6)));
  37. assert.equal(7, typedArrayLength(new Uint32Array(7)));
  38. assert.equal(8, typedArrayLength(new Float32Array(8)));
  39. assert.equal(9, typedArrayLength(new Float64Array(9)));
  40. assert.equal(10, typedArrayLength(new BigInt64Array(10)));
  41. assert.equal(11, typedArrayLength(new BigUint64Array(11)));
  42. ```
  43. ## Tests
  44. Simply clone the repo, `npm install`, and run `npm test`
  45. [1]: https://npmjs.org/package/typed-array-length
  46. [2]: https://versionbadg.es/inspect-js/typed-array-length.svg
  47. [5]: https://david-dm.org/inspect-js/typed-array-length.svg
  48. [6]: https://david-dm.org/inspect-js/typed-array-length
  49. [7]: https://david-dm.org/inspect-js/typed-array-length/dev-status.svg
  50. [8]: https://david-dm.org/inspect-js/typed-array-length#info=devDependencies
  51. [11]: https://nodei.co/npm/typed-array-length.png?downloads=true&stars=true
  52. [license-image]: http://img.shields.io/npm/l/typed-array-length.svg
  53. [license-url]: LICENSE
  54. [downloads-image]: http://img.shields.io/npm/dm/typed-array-length.svg
  55. [downloads-url]: http://npm-stat.com/charts.html?package=typed-array-length