is-map
TypeScript icon, indicating that this package has built-in type declarations

2.0.3 • Public • Published

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

Example

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 Sidebar

Install

npm i is-map

Weekly Downloads

17,085,744

Version

2.0.3

License

MIT

Unpacked Size

20.4 kB

Total Files

13

Last publish

Collaborators

  • ljharb