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1[![Build Status][travis-svg]][travis-url]
2[![dependency status][deps-svg]][deps-url]
3[![dev dependency status][dev-deps-svg]][dev-deps-url]
4
5# extend() for Node.js <sup>[![Version Badge][npm-version-png]][npm-url]</sup>
6
7`node-extend` is a port of the classic extend() method from jQuery. It behaves as you expect. It is simple, tried and true.
8
9Notes:
10
11* Since Node.js >= 4,
12 [`Object.assign`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
13 now offers the same functionality natively (but without the "deep copy" option).
14 See [ECMAScript 2015 (ES6) in Node.js](https://nodejs.org/en/docs/es6).
15* Some native implementations of `Object.assign` in both Node.js and many
16 browsers (since NPM modules are for the browser too) may not be fully
17 spec-compliant.
18 Check [`object.assign`](https://www.npmjs.com/package/object.assign) module for
19 a compliant candidate.
20
21## Installation
22
23This package is available on [npm][npm-url] as: `extend`
24
25``` sh
26npm install extend
27```
28
29## Usage
30
31**Syntax:** extend **(** [`deep`], `target`, `object1`, [`objectN`] **)**
32
33*Extend one object with one or more others, returning the modified object.*
34
35**Example:**
36
37``` js
38var extend = require('extend');
39extend(targetObject, object1, object2);
40```
41
42Keep in mind that the target object will be modified, and will be returned from extend().
43
44If a boolean true is specified as the first argument, extend performs a deep copy, recursively copying any objects it finds. Otherwise, the copy will share structure with the original object(s).
45Undefined properties are not copied. However, properties inherited from the object's prototype will be copied over.
46Warning: passing `false` as the first argument is not supported.
47
48### Arguments
49
50* `deep` *Boolean* (optional)
51If set, the merge becomes recursive (i.e. deep copy).
52* `target` *Object*
53The object to extend.
54* `object1` *Object*
55The object that will be merged into the first.
56* `objectN` *Object* (Optional)
57More objects to merge into the first.
58
59## License
60
61`node-extend` is licensed under the [MIT License][mit-license-url].
62
63## Acknowledgements
64
65All credit to the jQuery authors for perfecting this amazing utility.
66
67Ported to Node.js by [Stefan Thomas][github-justmoon] with contributions by [Jonathan Buchanan][github-insin] and [Jordan Harband][github-ljharb].
68
69[travis-svg]: https://travis-ci.org/justmoon/node-extend.svg
70[travis-url]: https://travis-ci.org/justmoon/node-extend
71[npm-url]: https://npmjs.org/package/extend
72[mit-license-url]: http://opensource.org/licenses/MIT
73[github-justmoon]: https://github.com/justmoon
74[github-insin]: https://github.com/insin
75[github-ljharb]: https://github.com/ljharb
76[npm-version-png]: http://versionbadg.es/justmoon/node-extend.svg
77[deps-svg]: https://david-dm.org/justmoon/node-extend.svg
78[deps-url]: https://david-dm.org/justmoon/node-extend
79[dev-deps-svg]: https://david-dm.org/justmoon/node-extend/dev-status.svg
80[dev-deps-url]: https://david-dm.org/justmoon/node-extend#info=devDependencies
81
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