is-map

is-map

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

Similar packages

Other packages similar to is-map

is

The `is` package offers a comprehensive set of type-checking utilities, including the ability to check if a value is a Map. Compared to `is-map`, `is` provides a broader range of type checks, making it a more versatile choice for projects that require extensive type validation.

lodash.ismap

Part of the Lodash library, `lodash.ismap` offers functionality similar to `is-map` by providing a method to check if a value is classified as a Map object. While `is-map` focuses solely on Map type checking, `lodash.ismap` benefits from being part of the larger Lodash ecosystem, which includes a wide array of utility functions for different data types.