70 lines
3.4 KiB
Plaintext
70 lines
3.4 KiB
Plaintext
# which-builtin-type <sup>[![Version Badge][2]][1]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![dependency status][5]][6]
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[![dev dependency status][7]][8]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][11]][1]
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What is the type of this builtin JavaScript value? Works cross-realm, without `instanceof`, and can not be fooled by a `constructor` property.
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## Example
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```js
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var whichBuiltinType = require('which-builtin-type');
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var assert = require('assert');
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assert.equal(undefined, whichBuiltinType(undefined));
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assert.equal(null, whichBuiltinType(null));
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assert.equal('Boolean', whichBuiltinType(false));
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assert.equal('Boolean', whichBuiltinType(true));
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assert.equal('Array', whichBuiltinType([]));
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assert.equal('Object', whichBuiltinType({}));
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assert.equal('RegExp', whichBuiltinType(/a/g));
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assert.equal('RegExp', whichBuiltinType(new RegExp('a', 'g')));
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assert.equal('Date', whichBuiltinType(new Date()));
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assert.equal('Number', whichBuiltinType(42));
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assert.equal('Number', whichBuiltinType(NaN));
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assert.equal('Number', whichBuiltinType(Infinity));
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assert.equal('Number', whichBuiltinType(new Number(42)));
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assert.equal('String', whichBuiltinType('foo'));
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assert.equal('String', whichBuiltinType(Object('foo')));
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assert.equal('Function', whichBuiltinType(function () {}));
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assert.equal('GeneratorFunction', whichBuiltinType(function* () {}));
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assert.equal('Function', whichBuiltinType(x => x * x));
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assert.equal('Array', whichBuiltinType([]));
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assert.equal('Int8Array', whichBuiltinType(new Int8Array()));
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assert.equal('Uint8Array', whichBuiltinType(new Uint8Array()));
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assert.equal('Uint8ClampedArray', whichBuiltinType(new Uint8ClampedArray()));
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assert.equal('Int16Array', whichBuiltinType(new Int16Array()));
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assert.equal('Uint16Array', whichBuiltinType(new Uint16Array()));
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assert.equal('Int32Array', whichBuiltinType(new Int32Array()));
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assert.equal('Uint32Array', whichBuiltinType(new Uint32Array()));
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assert.equal('Float32Array', whichBuiltinType(new Float32Array()));
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assert.equal('Float64Array', whichBuiltinType(new Float64Array()));
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assert.equal('BigInt64Array', whichBuiltinType(new BigInt64Array()));
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assert.equal('BigUint64Array', whichBuiltinType(new BigUint64Array()));
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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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[1]: https://npmjs.org/package/which-builtin-type
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[2]: https://versionbadg.es/inspect-js/which-builtin-type.svg
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[5]: https://david-dm.org/inspect-js/which-builtin-type.svg
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[6]: https://david-dm.org/inspect-js/which-builtin-type
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[7]: https://david-dm.org/inspect-js/which-builtin-type/dev-status.svg
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[8]: https://david-dm.org/inspect-js/which-builtin-type#info=devDependencies
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[11]: https://nodei.co/npm/which-builtin-type.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/which-builtin-type.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/which-builtin-type.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=which-builtin-type
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[codecov-image]: https://codecov.io/gh/inspect-js/which-builtin-type/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/inspect-js/which-builtin-type/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/which-builtin-type
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[actions-url]: https://github.com/inspect-js/which-builtin-type/actions
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