is-symbol
Advanced tools
Package description
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.
While not a direct equivalent, `core-js-pure/features/symbol` provides polyfills for Symbol and its methods in environments where it's not supported natively. This package can be used in conjunction with symbol checking to ensure compatibility across different JavaScript environments, offering broader functionality than `is-symbol` but with a focus on polyfilling rather than type checking.
Changelog
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 94a63480692681ed47833Readme
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
FAQs
Determine if a value is an ES6 Symbol or not.
The npm package is-symbol receives a total of 25,906,880 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.
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