https://github.com/inspect-js/is-map

Is this value a JS Map? This module works cross-realm/iframe, and despite %Symbol.toStringTag%.
https://github.com/inspect-js/is-map

collection ecmascript is javascript map set

Last synced: about 1 month ago
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Is this value a JS Map? This module works cross-realm/iframe, and despite %Symbol.toStringTag%.

• Host: GitHub
• URL: https://github.com/inspect-js/is-map
• Owner: inspect-js
• License: mit
• Created: 2019-11-09T23:15:38.000Z (almost 5 years ago)
• Default Branch: main
• Last Pushed: 2024-03-11T05:03:43.000Z (6 months ago)
• Last Synced: 2024-07-18T06:40:01.729Z (2 months ago)
• Topics: collection, ecmascript, is, javascript, map, set
• Language: JavaScript
• Homepage:
• Size: 85 KB
• Stars: 8
• Watchers: 4
• Forks: 5
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

Awesome Lists containing this project

README

        
# is-map [![Version Badge][npm-version-svg]][package-url]

[![github actions][actions-image]][actions-url]

[![coverage][codecov-image]][codecov-url]

[![License][license-image]][license-url]

[![Downloads][downloads-image]][downloads-url]

[![npm badge][npm-badge-png]][package-url]

Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

## Example

```js

var isMap = require('is-map');

assert(!isMap(function () {}));

assert(!isMap(null));

assert(!isMap(function* () { yield 42; return Infinity; });

assert(!isMap(Symbol('foo')));

assert(!isMap(1n));

assert(!isMap(Object(1n)));

assert(!isMap(new Set()));

assert(!isMap(new WeakSet()));

assert(!isMap(new WeakMap()));

assert(isMap(new Map()));

class MyMap extends Map {}

assert(isMap(new MyMap()));

```

## Tests

Simply clone the repo, `npm install`, and run `npm test`

[package-url]: https://npmjs.org/package/is-map

[npm-version-svg]: https://versionbadg.es/inspect-js/is-map.svg

[deps-svg]: https://david-dm.org/inspect-js/is-map.svg

[deps-url]: https://david-dm.org/inspect-js/is-map

[dev-deps-svg]: https://david-dm.org/inspect-js/is-map/dev-status.svg

[dev-deps-url]: https://david-dm.org/inspect-js/is-map#info=devDependencies

[npm-badge-png]: https://nodei.co/npm/is-map.png?downloads=true&stars=true

[license-image]: https://img.shields.io/npm/l/is-map.svg

[license-url]: LICENSE

[downloads-image]: https://img.shields.io/npm/dm/is-map.svg

[downloads-url]: https://npm-stat.com/charts.html?package=is-map

[codecov-image]: https://codecov.io/gh/inspect-js/is-map/branch/main/graphs/badge.svg

[codecov-url]: https://app.codecov.io/gh/inspect-js/is-map/

[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-map

[actions-url]: https://github.com/inspect-js/is-map/actions