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clone

deep cloning of objects and arrays


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Package description

What is clone?

The clone npm package is a utility for cloning JavaScript objects. It can create deep copies of objects, arrays, dates, and other types, ensuring that changes to the cloned object do not affect the original. It is useful when you need to work with copies of data without altering the original source.

What are clone's main functionalities?

Cloning objects

This feature allows you to create a deep copy of an object, so that changes to the cloned object do not affect the original object.

{"const clone = require('clone');
const obj = { a: 1, b: { c: 2 } };
const objClone = clone(obj);
console.log(objClone); // { a: 1, b: { c: 2 } }
objClone.b.c = 3;
console.log(obj.b.c); // 2, original object is not affected"}

Cloning arrays

This feature allows you to create a deep copy of an array, including any nested arrays, without affecting the original array.

{"const clone = require('clone');
const arr = [1, 2, [3, 4]];
const arrClone = clone(arr);
console.log(arrClone); // [1, 2, [3, 4]]
arrClone[2][0] = 5;
console.log(arr[2][0]); // 3, original array is not affected"}

Cloning dates

This feature allows you to clone Date objects, creating a new instance that represents the same moment in time as the original.

{"const clone = require('clone');
const date = new Date();
const dateClone = clone(date);
console.log(dateClone); // date object representing the same moment in time
console.log(date === dateClone); // false, they are different instances"}

Other packages similar to clone

Readme

Source

clone

build status downloads

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.

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Package last updated on 21 Mar 2018

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