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
Copyright © 2011-2016 Paul Vorbach and
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.
