Product
Introducing Java Support in Socket
We're excited to announce that Socket now supports the Java programming language.
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({})); // false
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.
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
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eslint
, @ljharb/eslint-config
, auto-changelog
, es5-shim
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eslint
, @ljharb/eslint-config
, aud
, object-inspect
, tape
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engines.node
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script for npm 7+ d3b7661
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FAQs
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 14,326,360 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.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Product
We're excited to announce that Socket now supports the Java programming language.
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