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