has-symbols
Advanced tools
Package description
The has-symbols npm package is used to determine if the JavaScript environment has native support for ES6/ES2015 symbols. Symbols are a new primitive type introduced in ES6 that enable the creation of unique identifiers for object properties. The has-symbols package provides a simple way to check for symbol support, which is useful for library authors who want to create code that is compatible with both modern and older environments.
Check for native Symbol support
This feature allows you to check if the current JavaScript environment supports ES6 symbols natively. The function `hasSymbols()` returns a boolean indicating the presence of native symbol support.
var hasSymbols = require('has-symbols');
if (hasSymbols()) {
console.log('Environment has native Symbol support');
} else {
console.log('Environment does not have native Symbol support');
}Check for well-known symbols
This feature allows you to check for the presence of specific well-known symbols like `Symbol.hasInstance`, `Symbol.iterator`, etc. The function `hasSymbols(shim)` takes a string argument representing the well-known symbol and returns a boolean indicating its presence.
var hasSymbols = require('has-symbols');
if (hasSymbols('hasInstance')) {
console.log('Environment has Symbol.hasInstance');
} else {
console.log('Environment does not have Symbol.hasInstance');
}The es-abstract package provides utility functions for ECMAScript language abstract operations. It includes checks for symbol support similar to has-symbols but goes beyond that by offering a wide range of ECMAScript compliance-related utilities.
The is-symbol package is used to check if a value is an ES6 Symbol or not. While has-symbols checks for the existence of Symbol support in the environment, is-symbol is used to verify if a given value is of the Symbol type.
Changelog
v1.0.3 - 2022-03-01
node/install instead of node/run; use codecov action 518b28fbugs and homepage fields; reorder package.json c480b1301d0ee06424ebeeslint, @ljharb/eslint-config, aud, auto-changelog, tape dfa7e7feslint, @ljharb/eslint-config, safe-publish-latest, tape 0c8d436eslint, @ljharb/eslint-config, aud, tape 9026554eaa9682eslint, tape bc7a3baeslint, auto-changelog 0ace00aprepublishOnly script for npm 7+ 093f72b9b80d3dReadme
Determine if the JS environment has Symbol support. Supports spec, or shams.
var hasSymbols = require('has-symbols');
hasSymbols() === true; // if the environment has native Symbol support. Not polyfillable, not forgeable.
var hasSymbolsKinda = require('has-symbols/shams');
hasSymbolsKinda() === true; // if the environment has a Symbol sham that mostly follows the spec.
Simply clone the repo, npm install, and run npm test
FAQs
Determine if the JS environment has Symbol support. Supports spec, or shams.
The npm package has-symbols receives a total of 28,492,452 weekly downloads. As such, has-symbols popularity was classified as popular.
We found that has-symbols 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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