forked from zhurui/management
153 lines
5.1 KiB
Markdown
153 lines
5.1 KiB
Markdown
# shallow-clone [](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W8YFZ425KND68) [](https://www.npmjs.com/package/shallow-clone) [](https://npmjs.org/package/shallow-clone) [](https://npmjs.org/package/shallow-clone) [](https://travis-ci.org/jonschlinkert/shallow-clone)
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> Creates a shallow clone of any JavaScript value.
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Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
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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 shallow-clone
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```
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## Usage
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```js
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const clone = require('shallow-clone');
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```
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**Supports**
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* array buffers
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* arrays
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* buffers
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* dates
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* errors
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* float32 arrays
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* float64 arrays
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* int16 arrays
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* int32 arrays
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* int8 arrays
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* maps
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* objects
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* primitives
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* regular expressions
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* sets
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* symbols
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* uint16 arrays
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* uint32 arrays
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* uint8 arrays
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* uint8clamped arrays
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## Arrays
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By default, only the array itself is cloned (shallow), use [clone-deep](https://github.com/jonschlinkert/clone-deep) if you also need the elements in the array to be cloned.
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```js
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const arr = [{ a: 0 }, { b: 1 }];
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const foo = clone(arr);
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// foo => [{ 'a': 0 }, { 'b': 1 }]
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// array is cloned
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assert(actual === expected); // false
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// array elements are not
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assert.deepEqual(actual[0], expected[0]); // true
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```
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## Objects
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Only the object is shallow cloned, use [clone-deep](https://github.com/jonschlinkert/clone-deep) if you also need the values in the object to be cloned.
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```js
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console.log(clone({ a: 1, b: 2, c: 3 }));
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//=> {a: 1, b: 2, c: 3 }
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```
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## RegExp
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Clones regular expressions and flags, and preserves the `.lastIndex`.
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```js
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const regex = clone(/foo/g); //=> /foo/g
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// you can manually reset lastIndex if necessary
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regex.lastIndex = 0;
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```
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## Primitives
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Simply returns primitives unchanged.
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```js
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clone(0); //=> 0
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clone('foo'); //=> 'foo'
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```
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## About
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<details>
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<summary><strong>Contributing</strong></summary>
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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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</details>
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<details>
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<summary><strong>Running Tests</strong></summary>
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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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</details>
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<details>
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<summary><strong>Building docs</strong></summary>
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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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</details>
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### Related projects
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You might also be interested in these projects:
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* [assign-deep](https://www.npmjs.com/package/assign-deep): Deeply assign the values of all enumerable-own-properties and symbols from one or more source objects… [more](https://github.com/jonschlinkert/assign-deep) | [homepage](https://github.com/jonschlinkert/assign-deep "Deeply assign the values of all enumerable-own-properties and symbols from one or more source objects to a target object. Returns the target object.")
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* [clone-deep](https://www.npmjs.com/package/clone-deep): Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives. | [homepage](https://github.com/jonschlinkert/clone-deep "Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives.")
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* [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.")
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* [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.")
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 20 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 2 | [doowb](https://github.com/doowb) |
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| 1 | [jakub-g](https://github.com/jakub-g) |
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### Author
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**Jon Schlinkert**
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* [GitHub Profile](https://github.com/jonschlinkert)
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* [Twitter Profile](https://twitter.com/jonschlinkert)
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* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)
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### License
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Copyright © 2019, [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), v0.8.0, on April 15, 2019._ |