The is-weakset npm package is a utility that allows developers to check if a given value is an instance of a WeakSet. WeakSets are collections of objects, similar to Sets, but with some key differences. Specifically, the objects in a WeakSet are held weakly, meaning if there is no other reference to an object stored in the WeakSet, it can be garbage collected. This package provides a simple and straightforward way to determine if a value is a WeakSet, which can be particularly useful when working with complex data structures or when implementing certain types of data handling logic.

What are is-weakset's main functionalities?

Check if a value is a WeakSet

This feature allows developers to check if a given value is an instance of a WeakSet. The code sample demonstrates how to use the is-weakset package to verify if a variable (ws) is a WeakSet, which returns true. It also shows that using the same function with a Set (notWs) returns false, illustrating the package's ability to distinguish between WeakSets and other types of objects.

"use strict";\nconst isWeakset = require('is-weakset');\n\nconst ws = new WeakSet();\nconst result = isWeakset(ws); // true\n\nconsole.log(result); // Outputs: true\n\nconst notWs = new Set();\nconsole.log(isWeakset(notWs)); // Outputs: false

Other packages similar to is-weakset

Changelog

Source

v2.0.2 - 2021-12-12

Commits

[actions] reuse common workflows a8f7c7f
[Tests] migrate tests to Github Actions f38af72
[Refactor] use call-bind and get-intrinsic to be more robust 5102e7e
[meta] do not publish github action workflow files 6ac6e8e
[actions] use node/install instead of node/run; use codecov action 304af52
[Dev Deps] update eslint, @ljharb/eslint-config, aud, auto-changelog, es6-shim, object-inspect, tape b82fb5f
[Tests] run nyc on all tests; use tape runner 89e2611
[Dev Deps] update eslint, @ljharb/eslint-config, es5-shim, object-inspect, safe-publish-latest, tape 42b0bdc
[actions] update codecov uploader 112697a
[actions] add "Allow Edits" workflow 1af6ffe
[readme] remove travis badge dff769b
[Dev Deps] update eslint, @ljharb/eslint-config, aud, object-inspect, tape 4494ced
[Dev Deps] update eslint, @ljharb/eslint-config, es5-shim, tape a2c11c6
[Tests] add core-js tests cd619e9
[readme] add actions and codecov badges d3cbefe
[Dev Deps] update eslint, @ljharb/eslint-config, tape 3d54035
[Dev Deps] update auto-changelog, eslint a80fb4a
[actions] switch Automatic Rease workflow to pull_request_target event b3b8aee
[Dev Deps] update es5-shim, tape 5ba5ca8
[meta] use prepublishOnly script for npm 7+ b4f7636
[Dev Deps] update auto-changelog; add aud 2ccd594
[Fix] when WeakSet lacks a has, return false 53a2cbc
[Tests] only audit prod deps f74aaf5
[meta] normalize line endings 31f60a6

Readme

Source

is-weakset

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

Example

var isWeakSet = require('is-weakset');
assert(!isWeakSet(function () {}));
assert(!isWeakSet(null));
assert(!isWeakSet(function* () { yield 42; return Infinity; });
assert(!isWeakSet(Symbol('foo')));
assert(!isWeakSet(1n));
assert(!isWeakSet(Object(1n)));

assert(!isWeakSet(new Set()));
assert(!isWeakSet(new WeakMap()));
assert(!isWeakSet(new Map()));

assert(isWeakSet(new WeakSet()));

class MyWeakSet extends WeakSet {}
assert(isWeakSet(new MyWeakSet()));

Tests

Simply clone the repo, npm install, and run npm test

Keywords

FAQs

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Last updated on 13 Dec 2021

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