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