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# is-descriptor [](https://www.npmjs.com/package/is-descriptor) [](https://npmjs.org/package/is-descriptor) [](https://npmjs.org/package/is-descriptor) [](https://travis-ci.org/jonschlinkert/is-descriptor) > Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors. ## Install Install with [npm](https://www.npmjs.com/): ```sh $ npm install --save is-descriptor ``` ## Usage ```js var isDescriptor = require('is-descriptor'); isDescriptor({value: 'foo'}) //=> true isDescriptor({get: function(){}, set: function(){}}) //=> true isDescriptor({get: 'foo', set: function(){}}) //=> false ``` You may also check for a descriptor by passing an object as the first argument and property name (`string`) as the second argument. ```js var obj = {}; obj.foo = 'abc'; Object.defineProperty(obj, 'bar', { value: 'xyz' }); isDescriptor(obj, 'foo'); //=> true isDescriptor(obj, 'bar'); //=> true ``` ## Examples ### value type `false` when not an object ```js isDescriptor('a'); //=> false isDescriptor(null); //=> false isDescriptor([]); //=> false ``` ### data descriptor `true` when the object has valid properties with valid values. ```js isDescriptor({value: 'foo'}); //=> true isDescriptor({value: noop}); //=> true ``` `false` when the object has invalid properties ```js isDescriptor({value: 'foo', bar: 'baz'}); //=> false isDescriptor({value: 'foo', bar: 'baz'}); //=> false isDescriptor({value: 'foo', get: noop}); //=> false isDescriptor({get: noop, value: noop}); //=> false ``` `false` when a value is not the correct type ```js isDescriptor({value: 'foo', enumerable: 'foo'}); //=> false isDescriptor({value: 'foo', configurable: 'foo'}); //=> false isDescriptor({value: 'foo', writable: 'foo'}); //=> false ``` ### accessor descriptor `true` when the object has valid properties with valid values. ```js isDescriptor({get: noop, set: noop}); //=> true isDescriptor({get: noop}); //=> true isDescriptor({set: noop}); //=> true ``` `false` when the object has invalid properties ```js isDescriptor({get: noop, set: noop, bar: 'baz'}); //=> false isDescriptor({get: noop, writable: true}); //=> false isDescriptor({get: noop, value: true}); //=> false ``` `false` when an accessor is not a function ```js isDescriptor({get: noop, set: 'baz'}); //=> false isDescriptor({get: 'foo', set: noop}); //=> false isDescriptor({get: 'foo', bar: 'baz'}); //=> false isDescriptor({get: 'foo', set: 'baz'}); //=> false ``` `false` when a value is not the correct type ```js isDescriptor({get: noop, set: noop, enumerable: 'foo'}); //=> false isDescriptor({set: noop, configurable: 'foo'}); //=> false isDescriptor({get: noop, configurable: 'foo'}); //=> false ``` ## About ### Related projects * [is-accessor-descriptor](https://www.npmjs.com/package/is-accessor-descriptor): Returns true if a value has the characteristics of a valid JavaScript accessor descriptor. | [homepage](https://github.com/jonschlinkert/is-accessor-descriptor "Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.") * [is-data-descriptor](https://www.npmjs.com/package/is-data-descriptor): Returns true if a value has the characteristics of a valid JavaScript data descriptor. | [homepage](https://github.com/jonschlinkert/is-data-descriptor "Returns true if a value has the characteristics of a valid JavaScript data descriptor.") * [is-descriptor](https://www.npmjs.com/package/is-descriptor): Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for… [more](https://github.com/jonschlinkert/is-descriptor) | [homepage](https://github.com/jonschlinkert/is-descriptor "Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.") * [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.") ### Contributing Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new). ### Contributors | **Commits** | **Contributor** | | --- | --- | | 24 | [jonschlinkert](https://github.com/jonschlinkert) | | 1 | [doowb](https://github.com/doowb) | | 1 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) | ### Building docs _(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ``` ### Running tests Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command: ```sh $ npm install && npm test ``` ### Author **Jon Schlinkert** * [github/jonschlinkert](https://github.com/jonschlinkert) * [twitter/jonschlinkert](https://twitter.com/jonschlinkert) ### License Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 22, 2017._
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