77 lines
2.3 KiB
Markdown
77 lines
2.3 KiB
Markdown
# node.extend
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A port of jQuery.extend that **actually works** on node.js
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[![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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[![browser support][testling-png]][testling-url]
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## Description
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None of the existing ones on npm really work therefore I ported it myself.
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## Usage
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To install this module in your current working directory (which should already contain a package.json), run
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```
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npm install node.extend
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```
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You can additionally just list the module in your [package.json](https://npmjs.org/doc/json.html) and run npm install.
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Then, require this package where you need it:
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```
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var extend = require('node.extend');
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```
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The syntax for merging two objects is as follows:
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```
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var destObject = extend({}, sourceObject);
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// Where sourceObject is the object whose properties will be copied into another.
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// NOTE: In this situation, this is not a deep merge. See below on how to handle a deep merge.
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```
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For information about how the clone works internally, view source in lib/extend.js or checkout the doc from [jQuery][]
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### A Note About Deep Merge (avoiding pass-by-reference cloning)
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In order to force a deep merge, when extending an object, you must pass boolean true as the first argument to extend:
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```
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var destObject = extend(true, {}, sourceObject);
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// Where sourceObject is the object whose properties will be copied into another.
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```
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See [this article](http://www.jon-carlos.com/2013/is-javascript-call-by-value-or-call-by-reference/) for more information about the need for deep merges in JavaScript.
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## Credit
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- Jordan Harband [@ljharb][]
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## License
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Copyright 2011, John Resig
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Dual licensed under the MIT or GPL Version 2 licenses.
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http://jquery.org/license
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[testling-png]: https://ci.testling.com/dreamerslab/node.extend.png
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[testling-url]: https://ci.testling.com/dreamerslab/node.extend
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[travis-svg]: https://travis-ci.org/dreamerslab/node.extend.svg
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[travis-url]: https://travis-ci.org/dreamerslab/node.extend
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[deps-svg]: https://david-dm.org/dreamerslab/node.extend.svg
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[deps-url]: https://david-dm.org/dreamerslab/node.extend
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[dev-deps-svg]: https://david-dm.org/dreamerslab/node.extend/dev-status.svg
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[dev-deps-url]: https://david-dm.org/dreamerslab/node.extend#info=devDependencies
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[jQuery]: http://api.jquery.com/jQuery.extend/
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[@ljharb]: https://twitter.com/ljharb
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