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

Dependencies (0)

    Dev Dependencies (19)

    Package Sidebar

    Install

    npm i is-map

    Weekly Downloads

    15,777,796

    Version

    2.0.3

    License

    MIT

    Unpacked Size

    20.4 kB

    Total Files

    13

    Last publish

    Collaborators

    • ljharb