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85 lines
3.4 KiB
Markdown
85 lines
3.4 KiB
Markdown
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# for-in [](https://www.npmjs.com/package/for-in) [](https://npmjs.org/package/for-in) [](https://npmjs.org/package/for-in) [](https://travis-ci.org/jonschlinkert/for-in)
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> Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save for-in
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```
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## Usage
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```js
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var forIn = require('for-in');
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var obj = {a: 'foo', b: 'bar', c: 'baz'};
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var values = [];
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var keys = [];
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forIn(obj, function (value, key, o) {
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keys.push(key);
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values.push(value);
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});
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console.log(keys);
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//=> ['a', 'b', 'c'];
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console.log(values);
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//=> ['foo', 'bar', 'baz'];
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```
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## About
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### Related projects
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* [arr-flatten](https://www.npmjs.com/package/arr-flatten): Recursively flatten an array or arrays. This is the fastest implementation of array flatten. | [homepage](https://github.com/jonschlinkert/arr-flatten "Recursively flatten an array or arrays. This is the fastest implementation of array flatten.")
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* [collection-map](https://www.npmjs.com/package/collection-map): Returns an array of mapped values from an array or object. | [homepage](https://github.com/jonschlinkert/collection-map "Returns an array of mapped values from an array or object.")
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* [for-own](https://www.npmjs.com/package/for-own): Iterate over the own enumerable properties of an object, and return an object with properties… [more](https://github.com/jonschlinkert/for-own) | [homepage](https://github.com/jonschlinkert/for-own "Iterate over the own enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 16 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 2 | [paulirish](https://github.com/paulirish) |
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### Building docs
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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Running 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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.4.2, on February 28, 2017._
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