├── .editorconfig ├── .eslintrc.json ├── .gitattributes ├── .github └── FUNDING.yml ├── .gitignore ├── .travis.yml ├── .verb.md ├── LICENSE ├── README.md ├── index.js ├── package.json └── test.js /.editorconfig: -------------------------------------------------------------------------------- 1 | # http://editorconfig.org/ 2 | root = true 3 | 4 | [*] 5 | charset = utf-8 6 | end_of_line = lf 7 | indent_size = 2 8 | indent_style = space 9 | insert_final_newline = true 10 | trim_trailing_whitespace = true 11 | 12 | [{**/{actual,fixtures,expected,templates}/**,*.md}] 13 | trim_trailing_whitespace = false 14 | insert_final_newline = false 15 | -------------------------------------------------------------------------------- /.eslintrc.json: -------------------------------------------------------------------------------- 1 | { 2 | "extends": [ 3 | "eslint:recommended" 4 | ], 5 | 6 | "env": { 7 | "browser": false, 8 | "es6": true, 9 | "node": true, 10 | "mocha": true 11 | }, 12 | 13 | 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-------------------------------------------------------------------------------- 1 | # Enforce Unix newlines 2 | * text eol=lf 3 | 4 | # binaries 5 | *.ai binary 6 | *.psd binary 7 | *.jpg binary 8 | *.gif binary 9 | *.png binary 10 | *.jpeg binary 11 | -------------------------------------------------------------------------------- /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | github: jonschlinkert 2 | 3 | # Tidelift offers a subscription if your organization would benefit from professional support 4 | tidelift: npm/shallow-clone 5 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # always ignore files 2 | *.DS_Store 3 | .idea 4 | .vscode 5 | *.sublime-* 6 | 7 | # test related, or directories generated by tests 8 | test/actual 9 | actual 10 | coverage 11 | .nyc* 12 | 13 | # npm 14 | node_modules 15 | npm-debug.log 16 | 17 | # yarn 18 | yarn.lock 19 | yarn-error.log 20 | 21 | # misc 22 | _gh_pages 23 | _draft 24 | _drafts 25 | bower_components 26 | vendor 27 | temp 28 | tmp 29 | TODO.md 30 | package-lock.json -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | sudo: false 2 | os: 3 | - linux 4 | - osx 5 | - windows 6 | language: node_js 7 | node_js: 8 | - node 9 | - '11' 10 | - '10' 11 | - '9' 12 | - '8' 13 | -------------------------------------------------------------------------------- /.verb.md: -------------------------------------------------------------------------------- 1 | ## Usage 2 | 3 | ```js 4 | const clone = require('{%= name %}'); 5 | ``` 6 | 7 | **Supports** 8 | 9 | - array buffers 10 | - arrays 11 | - buffers 12 | - dates 13 | - errors 14 | - float32 arrays 15 | - float64 arrays 16 | - int16 arrays 17 | - int32 arrays 18 | - int8 arrays 19 | - maps 20 | - objects 21 | - primitives 22 | - regular expressions 23 | - sets 24 | - symbols 25 | - uint16 arrays 26 | - uint32 arrays 27 | - uint8 arrays 28 | - uint8clamped arrays 29 | 30 | 31 | ## Arrays 32 | 33 | By default, only the array itself is cloned (shallow), use [clone-deep][] if you also need the elements in the array to be cloned. 34 | 35 | ```js 36 | const arr = [{ a: 0 }, { b: 1 }]; 37 | const foo = clone(arr); 38 | // foo => [{ 'a': 0 }, { 'b': 1 }] 39 | 40 | // array is cloned 41 | assert(actual === expected); // false 42 | 43 | // array elements are not 44 | assert.deepEqual(actual[0], expected[0]); // true 45 | ``` 46 | 47 | ## Objects 48 | 49 | Only the object is shallow cloned, use [clone-deep][] if you also need the values in the object to be cloned. 50 | 51 | ```js 52 | console.log(clone({ a: 1, b: 2, c: 3 })); 53 | //=> {a: 1, b: 2, c: 3 } 54 | ``` 55 | 56 | 57 | ## RegExp 58 | 59 | Clones regular expressions and flags, and preserves the `.lastIndex`. 60 | 61 | ```js 62 | const regex = clone(/foo/g); //=> /foo/g 63 | // you can manually reset lastIndex if necessary 64 | regex.lastIndex = 0; 65 | ``` 66 | 67 | ## Primitives 68 | 69 | Simply returns primitives unchanged. 70 | 71 | ```js 72 | clone(0); //=> 0 73 | clone('foo'); //=> 'foo' 74 | ``` -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015-present, Jon Schlinkert. 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in 13 | all copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 21 | THE SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # shallow-clone [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W8YFZ425KND68) [![NPM version](https://img.shields.io/npm/v/shallow-clone.svg?style=flat)](https://www.npmjs.com/package/shallow-clone) [![NPM monthly downloads](https://img.shields.io/npm/dm/shallow-clone.svg?style=flat)](https://npmjs.org/package/shallow-clone) [![NPM total downloads](https://img.shields.io/npm/dt/shallow-clone.svg?style=flat)](https://npmjs.org/package/shallow-clone) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/shallow-clone.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/shallow-clone) 2 | 3 | > Creates a shallow clone of any JavaScript value. 4 | 5 | Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support. 6 | 7 | ## Install 8 | 9 | Install with [npm](https://www.npmjs.com/): 10 | 11 | ```sh 12 | $ npm install --save shallow-clone 13 | ``` 14 | 15 | ## Usage 16 | 17 | ```js 18 | const clone = require('shallow-clone'); 19 | ``` 20 | 21 | **Supports** 22 | 23 | * array buffers 24 | * arrays 25 | * buffers 26 | * dates 27 | * errors 28 | * float32 arrays 29 | * float64 arrays 30 | * int16 arrays 31 | * int32 arrays 32 | * int8 arrays 33 | * maps 34 | * objects 35 | * primitives 36 | * regular expressions 37 | * sets 38 | * symbols 39 | * uint16 arrays 40 | * uint32 arrays 41 | * uint8 arrays 42 | * uint8clamped arrays 43 | 44 | ## Arrays 45 | 46 | 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. 47 | 48 | ```js 49 | const arr = [{ a: 0 }, { b: 1 }]; 50 | const foo = clone(arr); 51 | // foo => [{ 'a': 0 }, { 'b': 1 }] 52 | 53 | // array is cloned 54 | assert(actual === expected); // false 55 | 56 | // array elements are not 57 | assert.deepEqual(actual[0], expected[0]); // true 58 | ``` 59 | 60 | ## Objects 61 | 62 | 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. 63 | 64 | ```js 65 | console.log(clone({ a: 1, b: 2, c: 3 })); 66 | //=> {a: 1, b: 2, c: 3 } 67 | ``` 68 | 69 | ## RegExp 70 | 71 | Clones regular expressions and flags, and preserves the `.lastIndex`. 72 | 73 | ```js 74 | const regex = clone(/foo/g); //=> /foo/g 75 | // you can manually reset lastIndex if necessary 76 | regex.lastIndex = 0; 77 | ``` 78 | 79 | ## Primitives 80 | 81 | Simply returns primitives unchanged. 82 | 83 | ```js 84 | clone(0); //=> 0 85 | clone('foo'); //=> 'foo' 86 | ``` 87 | 88 | ## About 89 | 90 |
91 | Contributing 92 | 93 | Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new). 94 | 95 |
96 | 97 |
98 | Running Tests 99 | 100 | 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: 101 | 102 | ```sh 103 | $ npm install && npm test 104 | ``` 105 | 106 |
107 | 108 |
109 | Building docs 110 | 111 | _(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.)_ 112 | 113 | To generate the readme, run the following command: 114 | 115 | ```sh 116 | $ npm install -g verbose/verb#dev verb-generate-readme && verb 117 | ``` 118 | 119 |
120 | 121 | ### Related projects 122 | 123 | You might also be interested in these projects: 124 | 125 | * [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.") 126 | * [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.") 127 | * [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.") 128 | * [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.") 129 | 130 | ### Contributors 131 | 132 | | **Commits** | **Contributor** | 133 | | --- | --- | 134 | | 20 | [jonschlinkert](https://github.com/jonschlinkert) | 135 | | 2 | [doowb](https://github.com/doowb) | 136 | | 1 | [jakub-g](https://github.com/jakub-g) | 137 | 138 | ### Author 139 | 140 | **Jon Schlinkert** 141 | 142 | * [GitHub Profile](https://github.com/jonschlinkert) 143 | * [Twitter Profile](https://twitter.com/jonschlinkert) 144 | * [LinkedIn Profile](https://linkedin.com/in/jonschlinkert) 145 | 146 | ### License 147 | 148 | Copyright © 2019, [Jon Schlinkert](https://github.com/jonschlinkert). 149 | Released under the [MIT License](LICENSE). 150 | 151 | *** 152 | 153 | _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on April 15, 2019._ -------------------------------------------------------------------------------- /index.js: -------------------------------------------------------------------------------- 1 | /*! 2 | * shallow-clone 3 | * 4 | * Copyright (c) 2015-present, Jon Schlinkert. 5 | * Released under the MIT License. 6 | */ 7 | 8 | 'use strict'; 9 | 10 | const valueOf = Symbol.prototype.valueOf; 11 | const typeOf = require('kind-of'); 12 | 13 | function clone(val, deep) { 14 | switch (typeOf(val)) { 15 | case 'array': 16 | return val.slice(); 17 | case 'object': 18 | return Object.assign({}, val); 19 | case 'date': 20 | return new val.constructor(Number(val)); 21 | case 'map': 22 | return new Map(val); 23 | case 'set': 24 | return new Set(val); 25 | case 'buffer': 26 | return cloneBuffer(val); 27 | case 'symbol': 28 | return cloneSymbol(val); 29 | case 'arraybuffer': 30 | return cloneArrayBuffer(val); 31 | case 'float32array': 32 | case 'float64array': 33 | case 'int16array': 34 | case 'int32array': 35 | case 'int8array': 36 | case 'uint16array': 37 | case 'uint32array': 38 | case 'uint8clampedarray': 39 | case 'uint8array': 40 | return cloneTypedArray(val); 41 | case 'regexp': 42 | return cloneRegExp(val); 43 | case 'error': 44 | return Object.create(val); 45 | default: { 46 | return val; 47 | } 48 | } 49 | } 50 | 51 | function cloneRegExp(val) { 52 | const flags = val.flags !== void 0 ? val.flags : (/\w+$/.exec(val) || void 0); 53 | const re = new val.constructor(val.source, flags); 54 | re.lastIndex = val.lastIndex; 55 | return re; 56 | } 57 | 58 | function cloneArrayBuffer(val) { 59 | const res = new val.constructor(val.byteLength); 60 | new Uint8Array(res).set(new Uint8Array(val)); 61 | return res; 62 | } 63 | 64 | function cloneTypedArray(val, deep) { 65 | return new val.constructor(val.buffer, val.byteOffset, val.length); 66 | } 67 | 68 | function cloneBuffer(val) { 69 | const len = val.length; 70 | const buf = Buffer.allocUnsafe ? Buffer.allocUnsafe(len) : Buffer.from(len); 71 | val.copy(buf); 72 | return buf; 73 | } 74 | 75 | function cloneSymbol(val) { 76 | return valueOf ? Object(valueOf.call(val)) : {}; 77 | } 78 | 79 | /** 80 | * Expose `clone` 81 | */ 82 | 83 | module.exports = clone; 84 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "shallow-clone", 3 | "description": "Creates a shallow clone of any JavaScript value.", 4 | "version": "3.0.1", 5 | "homepage": "https://github.com/jonschlinkert/shallow-clone", 6 | "author": "Jon Schlinkert (https://github.com/jonschlinkert)", 7 | "contributors": [ 8 | "Brian Woodward (https://twitter.com/doowb)", 9 | "Jon Schlinkert (http://twitter.com/jonschlinkert)" 10 | ], 11 | "repository": "jonschlinkert/shallow-clone", 12 | "bugs": { 13 | "url": "https://github.com/jonschlinkert/shallow-clone/issues" 14 | }, 15 | "license": "MIT", 16 | "files": [ 17 | "index.js" 18 | ], 19 | "main": "index.js", 20 | "engines": { 21 | "node": ">=8" 22 | }, 23 | "scripts": { 24 | "test": "mocha" 25 | }, 26 | "dependencies": { 27 | "kind-of": "^6.0.2" 28 | }, 29 | "devDependencies": { 30 | "gulp-format-md": "^2.0.0", 31 | "mocha": "^6.1.3" 32 | }, 33 | "keywords": [ 34 | "array", 35 | "clone", 36 | "copy", 37 | "extend", 38 | "mixin", 39 | "object", 40 | "primitive", 41 | "shallow" 42 | ], 43 | "verb": { 44 | "toc": false, 45 | "layout": "default", 46 | "tasks": [ 47 | "readme" 48 | ], 49 | "plugins": [ 50 | "gulp-format-md" 51 | ], 52 | "lint": { 53 | "reflinks": true 54 | }, 55 | "related": { 56 | "list": [ 57 | "assign-deep", 58 | "clone-deep", 59 | "is-plain-object", 60 | "kind-of" 61 | ] 62 | } 63 | } 64 | } 65 | -------------------------------------------------------------------------------- /test.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | require('mocha'); 4 | const assert = require('assert').strict; 5 | const clone = require('./'); 6 | 7 | describe('clone()', () => { 8 | describe('objects', () => { 9 | it('should shallow clone an array of primitives', () => { 10 | assert.deepEqual(clone(['alpha', 'beta', 'gamma']), ['alpha', 'beta', 'gamma']); 11 | }); 12 | 13 | it('should shallow clone an array with varied elements', () => { 14 | const val = [0, 'a', {}, [{}], [function() {}], function() {}]; 15 | assert.deepEqual(clone(val), val); 16 | }); 17 | 18 | it('should clone Map', () => { 19 | const a = new Map([[1, 5]]); 20 | const b = clone(a); 21 | a.set(2, 4); 22 | assert.notDeepEqual(a, b); 23 | }); 24 | 25 | it('should clone Set', () => { 26 | const a = new Set([2, 1, 3]); 27 | const b = clone(a); 28 | a.add(8); 29 | assert.notDeepEqual(a, b); 30 | }); 31 | 32 | it('should shallow clone arrays', () => { 33 | assert(clone([1, 2, 3]) !== [1, 2, 3]); 34 | assert.deepEqual(clone([1, 2, 3]), [1, 2, 3]); 35 | }); 36 | 37 | it('should shallow clone a regex with flags', () => { 38 | assert(clone(/foo/g) !== /foo/g); 39 | assert.deepEqual(clone(/foo/g), /foo/g); 40 | }); 41 | 42 | it('should shallow clone a regex without any flags', () => { 43 | assert(clone(/foo/) !== /foo/); 44 | assert.deepEqual(clone(/foo/), /foo/); 45 | }); 46 | 47 | it('should shallow clone a date', () => { 48 | const date = new Date(); 49 | assert(clone(date) !== date); 50 | assert.deepEqual(clone(date), date); 51 | }); 52 | 53 | it('should shallow clone objects', () => { 54 | assert.deepEqual(clone({ a: 1, b: 2, c: 3 }), { a: 1, b: 2, c: 3 }); 55 | }); 56 | 57 | it('should shallow clone an array of objects.', () => { 58 | const expected = [{ a: 0 }, { b: 1 }]; 59 | const actual = clone(expected); 60 | 61 | assert(actual !== expected); 62 | assert.deepEqual(actual, expected); 63 | assert.deepEqual(actual[0], expected[0]); 64 | }); 65 | }); 66 | 67 | describe('primitives', () => { 68 | it('should return primitives', () => { 69 | assert.equal(clone(0), 0); 70 | assert.equal(clone(1), 1); 71 | assert.equal(clone('foo'), 'foo'); 72 | }); 73 | 74 | it('should clone symbols', () => { 75 | const val = { prop: Symbol() }; 76 | const cloned = clone(val); 77 | assert.equal(typeof cloned.prop, 'symbol'); 78 | assert.notEqual(cloned, val); 79 | assert.equal(cloned.prop, val.prop); 80 | }); 81 | }); 82 | }); 83 | --------------------------------------------------------------------------------