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README.md
1#object-keys <sup>[![Version Badge][npm-version-svg]][package-url]</sup> 2 3[![Build Status][travis-svg]][travis-url] 4[![dependency status][deps-svg]][deps-url] 5[![dev dependency status][dev-deps-svg]][dev-deps-url] 6[![License][license-image]][license-url] 7[![Downloads][downloads-image]][downloads-url] 8 9[![npm badge][npm-badge-png]][package-url] 10 11[![browser support][testling-svg]][testling-url] 12 13An Object.keys shim. Invoke its "shim" method to shim Object.keys if it is unavailable. 14 15Most common usage: 16```js 17var keys = Object.keys || require('object-keys'); 18``` 19 20## Example 21 22```js 23var keys = require('object-keys'); 24var assert = require('assert'); 25var obj = { 26 a: true, 27 b: true, 28 c: true 29}; 30 31assert.deepEqual(keys(obj), ['a', 'b', 'c']); 32``` 33 34```js 35var keys = require('object-keys'); 36var assert = require('assert'); 37/* when Object.keys is not present */ 38delete Object.keys; 39var shimmedKeys = keys.shim(); 40assert.equal(shimmedKeys, keys); 41assert.deepEqual(Object.keys(obj), keys(obj)); 42``` 43 44```js 45var keys = require('object-keys'); 46var assert = require('assert'); 47/* when Object.keys is present */ 48var shimmedKeys = keys.shim(); 49assert.equal(shimmedKeys, Object.keys); 50assert.deepEqual(Object.keys(obj), keys(obj)); 51``` 52 53## Source 54Implementation taken directly from [es5-shim][es5-shim-url], with modifications, including from [lodash][lodash-url]. 55 56## Tests 57Simply clone the repo, `npm install`, and run `npm test` 58 59[package-url]: https://npmjs.org/package/object-keys 60[npm-version-svg]: http://versionbadg.es/ljharb/object-keys.svg 61[travis-svg]: https://travis-ci.org/ljharb/object-keys.svg 62[travis-url]: https://travis-ci.org/ljharb/object-keys 63[deps-svg]: https://david-dm.org/ljharb/object-keys.svg 64[deps-url]: https://david-dm.org/ljharb/object-keys 65[dev-deps-svg]: https://david-dm.org/ljharb/object-keys/dev-status.svg 66[dev-deps-url]: https://david-dm.org/ljharb/object-keys#info=devDependencies 67[testling-svg]: https://ci.testling.com/ljharb/object-keys.png 68[testling-url]: https://ci.testling.com/ljharb/object-keys 69[es5-shim-url]: https://github.com/es-shims/es5-shim/blob/master/es5-shim.js#L542-589 70[lodash-url]: https://github.com/lodash/lodash 71[npm-badge-png]: https://nodei.co/npm/object-keys.png?downloads=true&stars=true 72[license-image]: http://img.shields.io/npm/l/object-keys.svg 73[license-url]: LICENSE 74[downloads-image]: http://img.shields.io/npm/dm/object-keys.svg 75[downloads-url]: http://npm-stat.com/charts.html?package=object-keys 76 77