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
Buffers are not needed in browsers.)

Example

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:

{ 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.

Circular References

var a, b;

a = { hello: 'world' };

a.myself = a;
b = clone(a);

console.log(b);

This will print:

{ 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.

Bugs and Issues

If you encounter any bugs or issues, feel free to open an issue at
github or send me an email to
paul@vorba.ch. I also always like to hear from you, if you’re using my code.

License

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.