# clone-deep [![NPM version](https://img.shields.io/npm/v/clone-deep.svg?style=flat)](https://www.npmjs.com/package/clone-deep) [![NPM monthly downloads](https://img.shields.io/npm/dm/clone-deep.svg?style=flat)](https://npmjs.org/package/clone-deep) [![NPM total downloads](https://img.shields.io/npm/dt/clone-deep.svg?style=flat)](https://npmjs.org/package/clone-deep) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/clone-deep.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/clone-deep) > Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives. Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support. ## Install Install with [npm](https://www.npmjs.com/): ```sh $ npm install --save clone-deep ``` ## Usage ```js const cloneDeep = require('clone-deep'); let obj = { a: 'b' }; let arr = [obj]; let copy = cloneDeep(arr); obj.c = 'd'; console.log(copy); //=> [{ a: 'b' }] console.log(arr); //=> [{ a: 'b', c: 'd' }] ``` ## Heads up! The last argument specifies whether or not to clone instances (objects that are from a custom class or are not created by the `Object` constructor. This value may be `true` or the function use for cloning instances. When an `instanceClone` function is provided, it will be invoked to clone objects that are not "plain" objects (as defined by [isPlainObject](#isPlainObject)`isPlainObject`). If `instanceClone` is not specified, this library will not attempt to clone non-plain objects, and will simply copy the object reference. ## Attribution Initially based on [mout's](https://github.com/mout/mout) implementation of deepClone. ## About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

Running Tests

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: ```sh $ npm install && npm test ```

Building docs

_(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.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ```

### Related projects You might also be interested in these projects: * [is-plain-object](https://www.npmjs.com/package/is-plain-object): Returns true if an object was created by the `Object` constructor. | [homepage](https://github.com/jonschlinkert/is-plain-object "Returns true if an object was created by the `Object` constructor.") * [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.") * [kind-of](https://www.npmjs.com/package/kind-of): Get the native type of a value. | [homepage](https://github.com/jonschlinkert/kind-of "Get the native type of a value.") * [shallow-clone](https://www.npmjs.com/package/shallow-clone): Creates a shallow clone of any JavaScript value. | [homepage](https://github.com/jonschlinkert/shallow-clone "Creates a shallow clone of any JavaScript value.") ### Contributors | **Commits** | **Contributor** | | --- | --- | | 46 | [jonschlinkert](https://github.com/jonschlinkert) | | 2 | [yujunlong2000](https://github.com/yujunlong2000) | ### Author **Jon Schlinkert** * [GitHub Profile](https://github.com/jonschlinkert) * [Twitter Profile](https://twitter.com/jonschlinkert) * [LinkedIn Profile](https://linkedin.com/in/jonschlinkert) ### License Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on November 21, 2018._

	Stars	Issues	Version	Updated	Created
clone			2.1.2	6 years ago	13 years ago
clone-deep			4.0.1	5 years ago	10 years ago
deep-clone	6	50	4.0.0	a year ago	8 years ago
deepmerge	2,718	53	4.3.1	a year ago	12 years ago
fast-deepclone	9	11	1.0.1	5 years ago	7 years ago

clone vs clone-deep vs deep-clone vs deepmerge vs fast-deepclone

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