mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-25 09:55:15 +00:00
161 lines
5.2 KiB
Markdown
161 lines
5.2 KiB
Markdown
# is-data-descriptor [](https://www.npmjs.com/package/is-data-descriptor) [](https://npmjs.org/package/is-data-descriptor) [](https://npmjs.org/package/is-data-descriptor) [](https://travis-ci.org/jonschlinkert/is-data-descriptor)
|
|
|
|
> Returns true if a value has the characteristics of a valid JavaScript data descriptor.
|
|
|
|
Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
|
|
|
|
## Install
|
|
|
|
Install with [npm](https://www.npmjs.com/):
|
|
|
|
```sh
|
|
$ npm install --save is-data-descriptor
|
|
```
|
|
|
|
## Usage
|
|
|
|
```js
|
|
var isDataDesc = require('is-data-descriptor');
|
|
```
|
|
|
|
## Examples
|
|
|
|
`true` when the descriptor has valid properties with valid values.
|
|
|
|
```js
|
|
// `value` can be anything
|
|
isDataDesc({value: 'foo'})
|
|
isDataDesc({value: function() {}})
|
|
isDataDesc({value: true})
|
|
//=> true
|
|
```
|
|
|
|
`false` when not an object
|
|
|
|
```js
|
|
isDataDesc('a')
|
|
//=> false
|
|
isDataDesc(null)
|
|
//=> false
|
|
isDataDesc([])
|
|
//=> false
|
|
```
|
|
|
|
`false` when the object has invalid properties
|
|
|
|
```js
|
|
isDataDesc({value: 'foo', bar: 'baz'})
|
|
//=> false
|
|
isDataDesc({value: 'foo', bar: 'baz'})
|
|
//=> false
|
|
isDataDesc({value: 'foo', get: function(){}})
|
|
//=> false
|
|
isDataDesc({get: function(){}, value: 'foo'})
|
|
//=> false
|
|
```
|
|
|
|
`false` when a value is not the correct type
|
|
|
|
```js
|
|
isDataDesc({value: 'foo', enumerable: 'foo'})
|
|
//=> false
|
|
isDataDesc({value: 'foo', configurable: 'foo'})
|
|
//=> false
|
|
isDataDesc({value: 'foo', writable: 'foo'})
|
|
//=> false
|
|
```
|
|
|
|
## Valid properties
|
|
|
|
The only valid data descriptor properties are the following:
|
|
|
|
* `configurable` (required)
|
|
* `enumerable` (required)
|
|
* `value` (optional)
|
|
* `writable` (optional)
|
|
|
|
To be a valid data descriptor, either `value` or `writable` must be defined.
|
|
|
|
**Invalid properties**
|
|
|
|
A descriptor may have additional _invalid_ properties (an error will **not** be thrown).
|
|
|
|
```js
|
|
var foo = {};
|
|
|
|
Object.defineProperty(foo, 'bar', {
|
|
enumerable: true,
|
|
whatever: 'blah', // invalid, but doesn't cause an error
|
|
get: function() {
|
|
return 'baz';
|
|
}
|
|
});
|
|
|
|
console.log(foo.bar);
|
|
//=> 'baz'
|
|
```
|
|
|
|
## About
|
|
|
|
<details>
|
|
<summary><strong>Contributing</strong></summary>
|
|
|
|
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
|
|
|
|
</details>
|
|
|
|
<details>
|
|
<summary><strong>Running Tests</strong></summary>
|
|
|
|
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
|
|
```
|
|
|
|
</details>
|
|
|
|
<details>
|
|
<summary><strong>Building docs</strong></summary>
|
|
|
|
_(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
|
|
```
|
|
|
|
</details>
|
|
|
|
### Related projects
|
|
|
|
You might also be interested in these 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.")
|
|
|
|
### Contributors
|
|
|
|
| **Commits** | **Contributor** |
|
|
| --- | --- |
|
|
| 21 | [jonschlinkert](https://github.com/jonschlinkert) |
|
|
| 2 | [realityking](https://github.com/realityking) |
|
|
|
|
### 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 November 01, 2017._ |