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42 lines
1.5 KiB
42 lines
1.5 KiB
4 years ago
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# unbox-primitive <sup>[![Version Badge][2]][1]</sup>
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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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Unbox a boxed JS primitive value. This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and works despite ES6 Symbol.toStringTag.
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## Example
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```js
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var unboxPrimitive = require('unbox-primitive');
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var assert = require('assert');
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assert.equal(unboxPrimitive(new Boolean(false)), false);
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assert.equal(unboxPrimitive(new String('f')), 'f');
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assert.equal(unboxPrimitive(new Number(42)), 42);
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const s = Symbol();
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assert.equal(unboxPrimitive(Object(s)), s);
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assert.equal(unboxPrimitive(new BigInt(42)), 42n);
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// any primitive, or non-boxed-primitive object, will throw
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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/unbox-primitive
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[2]: https://versionbadg.es/ljharb/unbox-primitive.svg
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[5]: https://david-dm.org/ljharb/unbox-primitive.svg
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[6]: https://david-dm.org/ljharb/unbox-primitive
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[7]: https://david-dm.org/ljharb/unbox-primitive/dev-status.svg
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[8]: https://david-dm.org/ljharb/unbox-primitive#info=devDependencies
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[11]: https://nodei.co/npm/unbox-primitive.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/unbox-primitive.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/unbox-primitive.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=unbox-primitive
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