82 lines
3.0 KiB
Markdown
82 lines
3.0 KiB
Markdown
[![Build Status][travis-svg]][travis-url]
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[![dependency status][deps-svg]][deps-url]
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[![dev dependency status][dev-deps-svg]][dev-deps-url]
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# extend() for Node.js <sup>[![Version Badge][npm-version-png]][npm-url]</sup>
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`node-extend` is a port of the classic extend() method from jQuery. It behaves as you expect. It is simple, tried and true.
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Notes:
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* Since Node.js >= 4,
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[`Object.assign`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
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now offers the same functionality natively (but without the "deep copy" option).
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See [ECMAScript 2015 (ES6) in Node.js](https://nodejs.org/en/docs/es6).
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* Some native implementations of `Object.assign` in both Node.js and many
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browsers (since NPM modules are for the browser too) may not be fully
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spec-compliant.
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Check [`object.assign`](https://www.npmjs.com/package/object.assign) module for
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a compliant candidate.
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## Installation
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This package is available on [npm][npm-url] as: `extend`
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``` sh
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npm install extend
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```
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## Usage
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**Syntax:** extend **(** [`deep`], `target`, `object1`, [`objectN`] **)**
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*Extend one object with one or more others, returning the modified object.*
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**Example:**
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``` js
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var extend = require('extend');
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extend(targetObject, object1, object2);
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```
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Keep in mind that the target object will be modified, and will be returned from extend().
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If 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).
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Undefined properties are not copied. However, properties inherited from the object's prototype will be copied over.
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Warning: passing `false` as the first argument is not supported.
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### Arguments
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* `deep` *Boolean* (optional)
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If set, the merge becomes recursive (i.e. deep copy).
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* `target` *Object*
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The object to extend.
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* `object1` *Object*
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The object that will be merged into the first.
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* `objectN` *Object* (Optional)
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More objects to merge into the first.
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## License
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`node-extend` is licensed under the [MIT License][mit-license-url].
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## Acknowledgements
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All credit to the jQuery authors for perfecting this amazing utility.
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Ported to Node.js by [Stefan Thomas][github-justmoon] with contributions by [Jonathan Buchanan][github-insin] and [Jordan Harband][github-ljharb].
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[travis-svg]: https://travis-ci.org/justmoon/node-extend.svg
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[travis-url]: https://travis-ci.org/justmoon/node-extend
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[npm-url]: https://npmjs.org/package/extend
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[mit-license-url]: http://opensource.org/licenses/MIT
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[github-justmoon]: https://github.com/justmoon
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[github-insin]: https://github.com/insin
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[github-ljharb]: https://github.com/ljharb
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[npm-version-png]: http://versionbadg.es/justmoon/node-extend.svg
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[deps-svg]: https://david-dm.org/justmoon/node-extend.svg
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[deps-url]: https://david-dm.org/justmoon/node-extend
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[dev-deps-svg]: https://david-dm.org/justmoon/node-extend/dev-status.svg
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[dev-deps-url]: https://david-dm.org/justmoon/node-extend#info=devDependencies
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