The `is-symbol` npm package is designed to provide a simple and efficient way to check if a given value is a Symbol. This can be particularly useful when working with ES6 Symbols, ensuring that operations or functions that require a symbol as an argument are provided with the correct type of value.
Check if a value is a Symbol
This feature allows you to verify whether a given value is a Symbol. It's useful in scenarios where the type of a variable needs to be asserted before performing operations that are specific to Symbols.
const isSymbol = require('is-symbol');
console.log(isSymbol(Symbol('foo'))); // true
console.log(isSymbol('bar')); // falsePart of the Lodash library, `lodash.issymbol` provides a similar functionality to `is-symbol` by checking if a given value is a Symbol. However, it comes as part of the larger Lodash utility library, which includes a wide range of functions for different types of data manipulation and checking, potentially making it a heavier choice for projects that only require symbol checking.
Is this an ES6 Symbol value?
var isSymbol = require('is-symbol');
assert(!isSymbol(function () {}));
assert(!isSymbol(null));
assert(!isSymbol(function* () { yield 42; return Infinity; });
assert(isSymbol(Symbol.iterator));
assert(isSymbol(Symbol('foo')));
assert(isSymbol(Symbol.for('foo')));
assert(isSymbol(Object(Symbol('foo'))));
Simply clone the repo, npm install, and run npm test
v1.0.4 - 2021-05-08
997d43cnode/install instead of node/run; use codecov action fe0ccb73ab2748f20fafenyc on all tests 5c332fceslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect, tape c5a58a8bcd925833ae2d3eslint, @ljharb/eslint-config, aud, object-inspect, tape e53def0eslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect ae36504aae7f09eslint, @ljharb/eslint-config, tape d993faeeslint, @ljharb/eslint-config, tape 51808a5auto-changelog, tape c90040feslint, tape 9fee159prepublishOnly script for npm 7+ b166afc4a0fe3afbcbc9eauto-changelog; add aud e66ab98has-symbols 6ce7de51173c79pull_request_target event 94a63480692681ed47833FAQs
Determine if a value is an ES6 Symbol or not.
The npm package is-symbol receives a total of 31,688,388 weekly downloads. As such, is-symbol popularity was classified as popular.
We found that is-symbol demonstrated a not healthy version release cadence and project activity because the last version was released 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.
Research
Security News
Socket’s threat research team has detected six malicious npm packages typosquatting popular libraries to insert SSH backdoors.
Security News
MITRE's 2024 CWE Top 25 highlights critical software vulnerabilities like XSS, SQL Injection, and CSRF, reflecting shifts due to a refined ranking methodology.
Security News
In this segment of the Risky Business podcast, Feross Aboukhadijeh and Patrick Gray discuss the challenges of tracking malware discovered in open source softare.