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1# class-utils [![NPM version](https://img.shields.io/npm/v/class-utils.svg?style=flat)](https://www.npmjs.com/package/class-utils) [![NPM monthly downloads](https://img.shields.io/npm/dm/class-utils.svg?style=flat)](https://npmjs.org/package/class-utils) [![NPM total downloads](https://img.shields.io/npm/dt/class-utils.svg?style=flat)](https://npmjs.org/package/class-utils) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/class-utils.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/class-utils)
2
3> Utils for working with JavaScript classes and prototype methods.
4
5Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
6
7## Install
8
9Install with [npm](https://www.npmjs.com/):
10
11```sh
12$ npm install --save class-utils
13```
14
15## Usage
16
17```js
18var cu = require('class-utils');
19```
20
21## API
22
23### [.has](index.js#L43)
24
25Returns true if an array has any of the given elements, or an object has any of the give keys.
26
27**Params**
28
29* `obj` **{Object}**
30* `val` **{String|Array}**
31* `returns` **{Boolean}**
32
33**Example**
34
35```js
36cu.has(['a', 'b', 'c'], 'c');
37//=> true
38
39cu.has(['a', 'b', 'c'], ['c', 'z']);
40//=> true
41
42cu.has({a: 'b', c: 'd'}, ['c', 'z']);
43//=> true
44```
45
46### [.hasAll](index.js#L90)
47
48Returns true if an array or object has all of the given values.
49
50**Params**
51
52* `val` **{Object|Array}**
53* `values` **{String|Array}**
54* `returns` **{Boolean}**
55
56**Example**
57
58```js
59cu.hasAll(['a', 'b', 'c'], 'c');
60//=> true
61
62cu.hasAll(['a', 'b', 'c'], ['c', 'z']);
63//=> false
64
65cu.hasAll({a: 'b', c: 'd'}, ['c', 'z']);
66//=> false
67```
68
69### [.arrayify](index.js#L117)
70
71Cast the given value to an array.
72
73**Params**
74
75* `val` **{String|Array}**
76* `returns` **{Array}**
77
78**Example**
79
80```js
81cu.arrayify('foo');
82//=> ['foo']
83
84cu.arrayify(['foo']);
85//=> ['foo']
86```
87
88### [.hasConstructor](index.js#L152)
89
90Returns true if a value has a `contructor`
91
92**Params**
93
94* `value` **{Object}**
95* `returns` **{Boolean}**
96
97**Example**
98
99```js
100cu.hasConstructor({});
101//=> true
102
103cu.hasConstructor(Object.create(null));
104//=> false
105```
106
107### [.nativeKeys](index.js#L174)
108
109Get the native `ownPropertyNames` from the constructor of the given `object`. An empty array is returned if the object does not have a constructor.
110
111**Params**
112
113* `obj` **{Object}**: Object that has a `constructor`.
114* `returns` **{Array}**: Array of keys.
115
116**Example**
117
118```js
119cu.nativeKeys({a: 'b', b: 'c', c: 'd'})
120//=> ['a', 'b', 'c']
121
122cu.nativeKeys(function(){})
123//=> ['length', 'caller']
124```
125
126### [.getDescriptor](index.js#L208)
127
128Returns property descriptor `key` if it's an "own" property of the given object.
129
130**Params**
131
132* `obj` **{Object}**
133* `key` **{String}**
134* `returns` **{Object}**: Returns descriptor `key`
135
136**Example**
137
138```js
139function App() {}
140Object.defineProperty(App.prototype, 'count', {
141 get: function() {
142 return Object.keys(this).length;
143 }
144});
145cu.getDescriptor(App.prototype, 'count');
146// returns:
147// {
148// get: [Function],
149// set: undefined,
150// enumerable: false,
151// configurable: false
152// }
153```
154
155### [.copyDescriptor](index.js#L238)
156
157Copy a descriptor from one object to another.
158
159**Params**
160
161* `receiver` **{Object}**
162* `provider` **{Object}**
163* `name` **{String}**
164* `returns` **{Object}**
165
166**Example**
167
168```js
169function App() {}
170Object.defineProperty(App.prototype, 'count', {
171 get: function() {
172 return Object.keys(this).length;
173 }
174});
175var obj = {};
176cu.copyDescriptor(obj, App.prototype, 'count');
177```
178
179### [.copy](index.js#L264)
180
181Copy static properties, prototype properties, and descriptors
182from one object to another.
183
184**Params**
185
186* `receiver` **{Object}**
187* `provider` **{Object}**
188* `omit` **{String|Array}**: One or more properties to omit
189* `returns` **{Object}**
190
191### [.inherit](index.js#L299)
192
193Inherit the static properties, prototype properties, and descriptors
194from of an object.
195
196**Params**
197
198* `receiver` **{Object}**
199* `provider` **{Object}**
200* `omit` **{String|Array}**: One or more properties to omit
201* `returns` **{Object}**
202
203### [.extend](index.js#L343)
204
205Returns a function for extending the static properties, prototype properties, and descriptors from the `Parent` constructor onto `Child` constructors.
206
207**Params**
208
209* `Parent` **{Function}**: Parent ctor
210* `extend` **{Function}**: Optional extend function to handle custom extensions. Useful when updating methods that require a specific prototype.
211* `Child` **{Function}**: Child ctor
212* `proto` **{Object}**: Optionally pass additional prototype properties to inherit.
213* `returns` **{Object}**
214
215**Example**
216
217```js
218var extend = cu.extend(Parent);
219Parent.extend(Child);
220
221// optional methods
222Parent.extend(Child, {
223 foo: function() {},
224 bar: function() {}
225});
226```
227
228### [.bubble](index.js#L356)
229
230Bubble up events emitted from static methods on the Parent ctor.
231
232**Params**
233
234* `Parent` **{Object}**
235* `events` **{Array}**: Event names to bubble up
236
237## About
238
239<details>
240<summary><strong>Contributing</strong></summary>
241
242Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
243
244</details>
245
246<details>
247<summary><strong>Running Tests</strong></summary>
248
249Running 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:
250
251```sh
252$ npm install && npm test
253```
254
255</details>
256<details>
257<summary><strong>Building docs</strong></summary>
258
259_(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.)_
260
261To generate the readme, run the following command:
262
263```sh
264$ npm install -g verbose/verb#dev verb-generate-readme && verb
265```
266
267</details>
268
269### Related projects
270
271You might also be interested in these projects:
272
273* [define-property](https://www.npmjs.com/package/define-property): Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty. | [homepage](https://github.com/jonschlinkert/define-property "Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.")
274* [delegate-properties](https://www.npmjs.com/package/delegate-properties): Deep-clone properties from one object to another and make them non-enumerable, or make existing properties… [more](https://github.com/jonschlinkert/delegate-properties) | [homepage](https://github.com/jonschlinkert/delegate-properties "Deep-clone properties from one object to another and make them non-enumerable, or make existing properties on an object non-enumerable.")
275* [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.")
276
277### Contributors
278
279| **Commits** | **Contributor** |
280| --- | --- |
281| 34 | [jonschlinkert](https://github.com/jonschlinkert) |
282| 8 | [doowb](https://github.com/doowb) |
283| 2 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
284
285### Author
286
287**Jon Schlinkert**
288
289* [linkedin/in/jonschlinkert](https://linkedin.com/in/jonschlinkert)
290* [github/jonschlinkert](https://github.com/jonschlinkert)
291* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
292
293### License
294
295Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
296Released under the [MIT License](LICENSE).
297
298***
299
300_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on January 11, 2018._
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