cloner

An ES5+ compatible utility to deep or shallow copy and merge objects.

API

The module has two sub modules: shallow and deep. Both of them will have two methods: copy and merge.

cloner.shallow.copy(object):shallowCopy

Will loop over all own keys and copy them to a new object. The equivalent operation can be described as such:

// it's based on descriptors
Object.defineProperties(
  // it preserves inheritance
  Object.create(
    Object.getPrototypeOf(source)
  ),
  // it does shallow copy
  Reflect.ownKeys(source).reduce(function (d, k) {
    d[k] = Object.getOwnPropertyDescriptor(source, k);
  }, {})
  // or Reflect.getOwnPropertyDescriptors(source)
);

The cloner.shallow.copy utility is most likely what you are looking for instead of the underpowered Object.assign one.

cloner.shallow.merge(target, source1[, source2, sourceN]):target

Preserves what's already in the target and merge all own keys found in one or more passed sources.

var a = {a: 1, b: 2};
var b = cloner.shallow.merge({a: 3}, a);

b; // {a: 3, b: 2}

Probably the best option to merge states, ideal for statics or immutable properties.

cloner.deep.copy(object):deepCopy

Same as cloner.shallow.copy beside the fact every single own key will be deeply copied. Like its shallow counterpart, it does preserve inheritance and it's recursion aware, meaning it shouldn't fail with recursive properties, as already tested.

cloner.deep.merge(target, source1[, source2, sourceN]):target

Same as cloner.shallow.merge but each new own key will be deeply copied.

How to use

npm install cloner should do, otherwise grab the file you like the most in here.

License

Copyright (C) 2015 by Andrea Giammarchi - @WebReflection

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, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

ganapativs/cloner