is-set
Advanced tools
Package description
The `is-set` npm package is designed to provide a simple and efficient way to check if a given value is a Set object. This can be particularly useful when working with collections of unique values and you need to ensure that the data structure being manipulated or checked is indeed a Set.
Check if a value is a Set
This feature allows you to verify if a given value is an instance of a Set. It is particularly useful when you need to differentiate between Set objects and other iterable or collection types in JavaScript, such as Arrays, Objects, or even WeakSets. The code sample demonstrates how to use `is-set` to check various values, showing that it correctly identifies Set instances and distinguishes them from other types.
"use strict";\nconst isSet = require('is-set');\n\nconsole.log(isSet(new Set())); // true\nconsole.log(isSet(new WeakSet())); // false\nconsole.log(isSet([1, 2, 3])); // false\nconsole.log(isSet({})); // false\nconsole.log(isSet(undefined)); // false"While `lodash.isset` does not exist as a standalone package, Lodash as a utility library offers functions like `_.isSet` which provide similar functionality to `is-set`. Lodash's `_.isSet` function checks if a value is classified as a Set object. The main difference is that Lodash offers a wide range of utility functions beyond checking for Sets, making it a more comprehensive solution for different types of data manipulations and checks.
The `is` package offers a wide range of type-check functions, including checks for Sets. Similar to `is-set`, it can be used to determine if a given value is a Set. However, `is` goes beyond just Sets, offering type checks for a variety of JavaScript data types and structures, making it a more versatile package if you need to perform multiple types of checks.
Changelog
v2.0.2 - 2020-12-13
10a1a869611423eslint, @ljharb/eslint-config, aud, auto-changelog, es6-shim, object-inspect, tape 7d4d9b3nyc on all tests dff5fb66bed76aee9e740core-js tests 9ef1b4eeslint, @ljharb/eslint-config, tape 5661354pull_request_target event 2cea69ees5-shim, tape 9e24b51auto-changelog; add aud 69ae5565fe826ac7c67f66ef4ebdReadme
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
var isSet = require('is-set');
assert(!isSet(function () {}));
assert(!isSet(null));
assert(!isSet(function* () { yield 42; return Infinity; });
assert(!isSet(Symbol('foo')));
assert(!isSet(1n));
assert(!isSet(Object(1n)));
assert(!isSet(new Map()));
assert(!isSet(new WeakSet()));
assert(!isSet(new WeakMap()));
assert(isSet(new Set()));
class MySet extends Set {}
assert(isSet(new MySet()));
Simply clone the repo, npm install, and run npm test
FAQs
Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
The npm package is-set receives a total of 13,297,195 weekly downloads. As such, is-set popularity was classified as popular.
We found that is-set 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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