Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
The `is-map` npm package is a utility library designed to provide a simple and efficient way to check if a given value is a Map object. It is particularly useful in scenarios where type-checking is necessary to ensure that operations on map-like structures are performed safely and correctly.
Type Checking for Map Objects
This feature allows developers to check if a given value is an instance of a Map. It is particularly useful for validating inputs or ensuring that certain operations are only performed on Map objects. The code sample demonstrates how to use `is-map` to distinguish between Map objects and regular JavaScript objects.
const isMap = require('is-map');
console.log(isMap(new Map())); // true
console.log(isMap({})); // falseThe `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.
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.
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
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()));
Simply clone the repo, npm install, and run npm test
v2.0.3 - 2024-03-08
ce10d0fnpmignore to autogenerate an npmignore file e07e23acd13cfbnode/install instead of node/run; use codecov action 1e055f9eslint, @ljharb/eslint-config, object-inspect, safe-publish-latest, tape 12d125eeslint, @ljharb/eslint-config, aud, auto-changelog, es5-shim, object-inspect, tape adfb18ec5511b7@ljharb/eslint-config, aud, es6-shim, npmignore, object-inspect, tape b2c7d67bbad6448f57f98eslint, @ljharb/eslint-config, auto-changelog, es5-shim, object-inspect, tape d330ff4eslint, @ljharb/eslint-config, aud, object-inspect, tape 454e31ceslint, @ljharb/eslint-config, es5-shim, tape b43283d0fc119eeslint, object-inspect e2311f8engines.node 9bddaf2prepublishOnly script for npm 7+ d3b7661safe-publish-latest 00d7b69sideEffects flag bab4457FAQs
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
The npm package is-map receives a total of 22,228,586 weekly downloads. As such, is-map popularity was classified as popular.
We found that is-map demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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