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# is-callable <sup>[![Version Badge][2]][1]</sup> [![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][5]][6] [![dev dependency status][7]][8] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url] [![npm badge][11]][1] Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag. ## Supported engines Automatically tested in every minor version of node. Manually tested in: - Safari: v4 - v15 <sub>(4, 5, 5.1, 6.0.5, 6.2, 7.1, 8, 9.1.3, 10.1.2, 11.1.2, 12.1, 13.1.2, 14.1.2, 15.3, 15.6.1)</sub> - Note: Safari 9 has `class`, but `Function.prototype.toString` hides that progeny and makes them look like functions, so `class` constructors will be reported by this package as callable, when they are not in fact callable. - Chrome: v15 - v81, v83 - v106<sub>(every integer version)</sub> - Note: This includes Edge v80+ and Opera v15+, which matches Chrome - Firefox: v3, v3.6, v4 - v105 <sub>(every integer version)</sub> - Note: v45 - v54 has `class`, but `Function.prototype.toString` hides that progeny and makes them look like functions, so `class` constructors will be reported by this package as callable, when they are not in fact callable. - Note: in v42 - v63, `Function.prototype.toString` throws on HTML element constructors, or a Proxy to a function - Note: in v20 - v35, HTML element constructors are not callable, despite having typeof `function`. - Note: in v19, `document.all` is not callable. - IE: v6 - v11<sub>(every integer version</sub> - Opera: v11.1, v11.5, v11.6, v12.1, v12.14, v12.15, v12.16, v15+ <sub>v15+ matches Chrome</sub> ## Example ```js var isCallable = require('is-callable'); var assert = require('assert'); assert.notOk(isCallable(undefined)); assert.notOk(isCallable(null)); assert.notOk(isCallable(false)); assert.notOk(isCallable(true)); assert.notOk(isCallable([])); assert.notOk(isCallable({})); assert.notOk(isCallable(/a/g)); assert.notOk(isCallable(new RegExp('a', 'g'))); assert.notOk(isCallable(new Date())); assert.notOk(isCallable(42)); assert.notOk(isCallable(NaN)); assert.notOk(isCallable(Infinity)); assert.notOk(isCallable(new Number(42))); assert.notOk(isCallable('foo')); assert.notOk(isCallable(Object('foo'))); assert.ok(isCallable(function () {})); assert.ok(isCallable(function* () {})); assert.ok(isCallable(x => x * x)); ``` ## Install Install with ``` npm install is-callable ``` ## Tests Simply clone the repo, `npm install`, and run `npm test` [1]: https://npmjs.org/package/is-callable [2]: https://versionbadg.es/inspect-js/is-callable.svg [5]: https://david-dm.org/inspect-js/is-callable.svg [6]: https://david-dm.org/inspect-js/is-callable [7]: https://david-dm.org/inspect-js/is-callable/dev-status.svg [8]: https://david-dm.org/inspect-js/is-callable#info=devDependencies [11]: https://nodei.co/npm/is-callable.png?downloads=true&stars=true [license-image]: https://img.shields.io/npm/l/is-callable.svg [license-url]: LICENSE [downloads-image]: https://img.shields.io/npm/dm/is-callable.svg [downloads-url]: https://npm-stat.com/charts.html?package=is-callable [codecov-image]: https://codecov.io/gh/inspect-js/is-callable/branch/main/graphs/badge.svg [codecov-url]: https://app.codecov.io/gh/inspect-js/is-callable/ [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-callable [actions-url]: https://github.com/inspect-js/is-callable/actions