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-symbol 
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
v1.0.2 - 2018-09-20
eslint, tape, semver; use my personal shared eslint config e86aaea50bc07ftape, jscs, nsp, semver, eslint, @ljharb/eslint-config 45e17bdnode v10.0, v9.11, v8.11, v6.14, v4.9; use nvm install-latest-npm 44402cbnode v8.1, v7.10, v6.11, v4.8; improve matrix; old npm breaks on newer nodes 9047c23tape, covert, jscs, semver d57d1cenpm run eslint 0d75a66eslint 042fb3ahas-symbols and object-inspect 129bc68node v10.11, v8.12 c1822e8tape, jscs, eslint, @ljharb/eslint-config 089d2cfnode v8.4; newer npm breaks on older node 05ce701node/iojs versions now ship with an npm that understands ^. 241e6a6node and io.js versions. 5c8d5deeslint, @ljharb/eslint-config, nsp, semver, tape 06047bfjscs, nsp, semver, eslint, @ljharb/eslint-config 9d25dd7io.js v3.3, node v4.1 ce173bdnsp, eslint 29e5214semver, eslint 53be884eslint, nsp, semver, tape 3bd149cjscs 69b4231io.js v2.1 0b61ac7tape 5e1b200a191ff5nsp, eslint, @ljharb/eslint-config 97c87efio.js v2.2 42560e4tape, eslint 149b2f228bd1edio.js v3.0 c0dcc98node now supports Symbols now. d1853adtape f7a6575aae9c6aio.js v2.4 ab8f449io.js v2.3 58ce871FAQs
Determine if a value is an ES6 Symbol or not.
The npm package is-symbol receives a total of 30,088,532 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.
Security News
Research
An advanced npm supply chain attack is leveraging Ethereum smart contracts for decentralized, persistent malware control, evading traditional defenses.
Security News
Research
Attackers are impersonating Sindre Sorhus on npm with a fake 'chalk-node' package containing a malicious backdoor to compromise developers' projects.
Security News
The npm package for the LottieFiles Player web component was hit with a supply chain attack after a software engineer's npmjs credentials were compromised.