65 lines
2.6 KiB
Markdown
65 lines
2.6 KiB
Markdown
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# which-collection <sup>[![Version Badge][2]][1]</sup>
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[![Build Status][3]][4]
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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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Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
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## Example
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```js
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var whichCollection = require('which-collection');
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var assert = require('assert');
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assert.equal(false, whichCollection(undefined));
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assert.equal(false, whichCollection(null));
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assert.equal(false, whichCollection(false));
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assert.equal(false, whichCollection(true));
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assert.equal(false, whichCollection([]));
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assert.equal(false, whichCollection({}));
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assert.equal(false, whichCollection(/a/g));
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assert.equal(false, whichCollection(new RegExp('a', 'g')));
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assert.equal(false, whichCollection(new Date()));
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assert.equal(false, whichCollection(42));
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assert.equal(false, whichCollection(NaN));
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assert.equal(false, whichCollection(Infinity));
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assert.equal(false, whichCollection(new Number(42)));
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assert.equal(false, whichCollection(42n));
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assert.equal(false, whichCollection(Object(42n)));
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assert.equal(false, whichCollection('foo'));
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assert.equal(false, whichCollection(Object('foo')));
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assert.equal(false, whichCollection(function () {}));
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assert.equal(false, whichCollection(function* () {}));
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assert.equal(false, whichCollection(x => x * x));
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assert.equal(false, whichCollection([]));
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assert.equal('Map', whichCollection(new Map()));
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assert.equal('Set', whichCollection(new Set()));
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assert.equal('WeakMap', whichCollection(new WeakMap()));
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assert.equal('WeakSet', whichCollection(new WeakSet()));
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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-collection
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[2]: http://versionbadg.es/inspect-js/which-collection.svg
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[3]: https://travis-ci.org/inspect-js/which-collection.svg
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[4]: https://travis-ci.org/inspect-js/which-collection
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[5]: https://david-dm.org/inspect-js/which-collection.svg
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[6]: https://david-dm.org/inspect-js/which-collection
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[7]: https://david-dm.org/inspect-js/which-collection/dev-status.svg
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[8]: https://david-dm.org/inspect-js/which-collection#info=devDependencies
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[9]: https://ci.testling.com/inspect-js/which-collection.png
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[10]: https://ci.testling.com/inspect-js/which-collection
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[11]: https://nodei.co/npm/which-collection.png?downloads=true&stars=true
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[license-image]: http://img.shields.io/npm/l/which-collection.svg
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[license-url]: LICENSE
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[downloads-image]: http://img.shields.io/npm/dm/which-collection.svg
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[downloads-url]: http://npm-stat.com/charts.html?package=which-collection
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