extend-shallow

What is extend-shallow?

The extend-shallow npm package is used to copy the properties of one or more source objects to a target object. It is a utility for shallowly extending the properties of objects without deeply cloning them.

What are extend-shallow's main functionalities?

Shallow extend one object with another

This feature allows you to extend an object by adding properties from another object. The properties are copied over shallowly, meaning that if the property values are objects, they are not deeply cloned.

{"const extend = require('extend-shallow');
const obj1 = { a: 'a' };
const obj2 = { b: 'b' };
const result = extend(obj1, obj2);
// result is { a: 'a', b: 'b' }"}

Shallow extend with multiple source objects

This feature allows you to extend an object with properties from multiple source objects. The last source's properties will overwrite the properties of the same name in previous sources if they exist.

{"const extend = require('extend-shallow');
const obj1 = { a: 'a' };
const obj2 = { b: 'b' };
const obj3 = { c: 'c' };
const result = extend(obj1, obj2, obj3);
// result is { a: 'a', b: 'b', c: 'c' }"}

Other packages similar to extend-shallow

object-assign

The object-assign package is a polyfill for the Object.assign() method, which copies enumerable and own properties from source objects to a target object. It is similar to extend-shallow but is designed to mimic the behavior of the native JavaScript method.

lodash.assign

lodash.assign is a method from the Lodash library that assigns own enumerable properties of source objects to the destination object. It is similar to extend-shallow but comes with the additional utility functions provided by Lodash.

deep-extend

deep-extend is similar to extend-shallow but, as the name suggests, performs a deep extend, meaning that it recursively copies property values that are objects, resulting in a deep clone of the source objects' properties.

README

extend-shallow

Extend an object with the properties of additional objects. node.js/javascript util.

Install with npm

npm i extend-shallow --save

Running tests

Install dev dependencies.

npm i -d && npm test

Usage

var extend = require('extend-shallow');

extend({a: 'b'}, {c: 'd'})
//=> {a: 'b', c: 'd'}

Pass an empty object to shallow clone:

var obj = {};
extend(obj, {a: 'b'}, {c: 'd'})
//=> {a: 'b', c: 'd'}

Related

• is-plain-object: Returns true if an object was created by the Object constructor.
• kind-of: Get the native type of a value.
• for-own: Iterate over the own enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning false. JavaScript/Node.js.
• extend-shallow: Extend an object with the properties of additional objects. node.js/javascript util.
• isobject: Returns true if the value is an object and not an array or null.
• for-in: Iterate over the own and inherited enumerable properties of an objecte, and return an object with properties that evaluate to true from the callback. Exit early by returning false. JavaScript/Node.js

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright (c) 2015 Jon Schlinkert
Released under the MIT license

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This file was generated by verb-cli on February 27, 2015.