| 1 | # 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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| 2 |
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| 3 | > 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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| 4 |
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| 5 | ## Install
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| 6 |
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| 7 | Install with [npm](https://www.npmjs.com/):
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| 8 |
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| 9 | ```sh
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| 10 | $ npm install --save for-in
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| 11 | ```
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| 12 |
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| 13 | ## Usage
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| 14 |
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| 15 | ```js
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| 16 | var forIn = require('for-in');
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| 17 |
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| 18 | var obj = {a: 'foo', b: 'bar', c: 'baz'};
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| 19 | var values = [];
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| 20 | var keys = [];
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| 21 |
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| 22 | forIn(obj, function (value, key, o) {
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| 23 | keys.push(key);
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| 24 | values.push(value);
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| 25 | });
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| 26 |
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| 27 | console.log(keys);
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| 28 | //=> ['a', 'b', 'c'];
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| 29 |
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| 30 | console.log(values);
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| 31 | //=> ['foo', 'bar', 'baz'];
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| 32 | ```
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| 33 |
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| 34 | ## About
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| 35 |
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| 36 | ### Related projects
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| 37 |
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| 38 | * [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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| 39 | * [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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| 40 | * [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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| 41 |
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| 42 | ### Contributing
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| 43 |
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| 44 | Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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| 45 |
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| 46 | ### Contributors
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| 47 |
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| 48 | | **Commits** | **Contributor** |
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| 49 | | --- | --- |
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| 50 | | 16 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 51 | | 2 | [paulirish](https://github.com/paulirish) |
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| 52 |
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| 53 | ### Building docs
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| 54 |
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| 55 | _(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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| 56 |
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| 57 | To generate the readme, run the following command:
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| 58 |
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| 59 | ```sh
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| 60 | $ npm install -g verbose/verb#dev verb-generate-readme && verb
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| 61 | ```
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| 62 |
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| 63 | ### Running tests
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| 64 |
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| 65 | 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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| 66 |
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| 67 | ```sh
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| 68 | $ npm install && npm test
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| 69 | ```
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| 70 |
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| 71 | ### Author
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| 72 |
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| 73 | **Jon Schlinkert**
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| 74 |
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| 75 | * [github/jonschlinkert](https://github.com/jonschlinkert)
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| 76 | * [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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| 77 |
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| 78 | ### License
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| 79 |
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| 80 | Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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| 81 | Released under the [MIT License](LICENSE).
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| 82 |
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| 83 | ***
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| 84 |
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| 85 | _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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