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# clone [](http://travis-ci.org/pvorb/clone) [](http://npm-stat.com/charts.html?package=clone) offers foolproof _deep cloning_ of objects, arrays, numbers, strings, maps, sets, promises, etc. in JavaScript. **XSS vulnerability detected** ## Installation npm install clone (It also works with browserify, ender or standalone. You may want to use the option `noParse` in browserify to reduce the resulting file size, since usually `Buffer`s are not needed in browsers.) ## Example ~~~ javascript var clone = require('clone'); var a, b; a = { foo: { bar: 'baz' } }; // initial value of a b = clone(a); // clone a -> b a.foo.bar = 'foo'; // change a console.log(a); // show a console.log(b); // show b ~~~ This will print: ~~~ javascript { foo: { bar: 'foo' } } { foo: { bar: 'baz' } } ~~~ **clone** masters cloning simple objects (even with custom prototype), arrays, Date objects, and RegExp objects. Everything is cloned recursively, so that you can clone dates in arrays in objects, for example. ## API `clone(val, circular, depth)` * `val` -- the value that you want to clone, any type allowed * `circular` -- boolean Call `clone` with `circular` set to `false` if you are certain that `obj` contains no circular references. This will give better performance if needed. There is no error if `undefined` or `null` is passed as `obj`. * `depth` -- depth to which the object is to be cloned (optional, defaults to infinity) * `prototype` -- sets the prototype to be used when cloning an object. (optional, defaults to parent prototype). * `includeNonEnumerable` -- set to `true` if the non-enumerable properties should be cloned as well. Non-enumerable properties on the prototype chain will be ignored. (optional, defaults to `false`) `clone.clonePrototype(obj)` * `obj` -- the object that you want to clone Does a prototype clone as [described by Oran Looney](http://oranlooney.com/functional-javascript/). ## Circular References ~~~ javascript var a, b; a = { hello: 'world' }; a.myself = a; b = clone(a); console.log(b); ~~~ This will print: ~~~ javascript { hello: "world", myself: [Circular] } ~~~ So, `b.myself` points to `b`, not `a`. Neat! ## Test npm test ## Changelog ### v2.1.2 #### 2018-03-21 - Use `Buffer.allocUnsafe()` on Node >= 4.5.0 (contributed by @ChALkeR) ### v2.1.1 #### 2017-03-09 - Fix build badge in README - Add support for cloning Maps and Sets on Internet Explorer ### v2.1.0 #### 2016-11-22 - Add support for cloning Errors - Exclude non-enumerable symbol-named object properties from cloning - Add option to include non-enumerable own properties of objects ### v2.0.0 #### 2016-09-28 - Add support for cloning ES6 Maps, Sets, Promises, and Symbols ### v1.0.3 #### 2017-11-08 - Close XSS vulnerability in the NPM package, which included the file `test-apart-ctx.html`. This vulnerability was disclosed by Juho Nurminen of 2NS - Second Nature Security. ### v1.0.2 (deprecated) #### 2015-03-25 - Fix call on getRegExpFlags - Refactor utilities - Refactor test suite ### v1.0.1 (deprecated) #### 2015-03-04 - Fix nodeunit version - Directly call getRegExpFlags ### v1.0.0 (deprecated) #### 2015-02-10 - Improve browser support - Improve browser testability - Move helper methods to private namespace ## Caveat Some special objects like a socket or `process.stdout`/`stderr` are known to not be cloneable. If you find other objects that cannot be cloned, please [open an issue](https://github.com/pvorb/clone/issues/new). ## Bugs and Issues If you encounter any bugs or issues, feel free to [open an issue at github](https://github.com/pvorb/clone/issues) or send me an email to <paul@vorba.ch>. I also always like to hear from you, if you’re using my code. ## License Copyright © 2011-2016 [Paul Vorbach](https://paul.vorba.ch/) and [contributors](https://github.com/pvorb/clone/graphs/contributors). Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.