# object-assign [![Build Status](https://travis-ci.org/sindresorhus/object-assign.svg?branch=master)](https://travis-ci.org/sindresorhus/object-assign)

> ES2015 [`Object.assign()`](http://www.2ality.com/2014/01/object-assign.html) [ponyfill](https://ponyfill.com)

## Use the built-in

Node.js 4 and up, as well as every evergreen browser (Chrome, Edge, Firefox, Opera, Safari),
support `Object.assign()` :tada:. If you target only those environments, then by all
means, use `Object.assign()` instead of this package.

## Install

```
$ npm install --save object-assign
```

## Usage

```js
const objectAssign = require("object-assign");

objectAssign({ foo: 0 }, { bar: 1 });
//=> {foo: 0, bar: 1}

// multiple sources
objectAssign({ foo: 0 }, { bar: 1 }, { baz: 2 });
//=> {foo: 0, bar: 1, baz: 2}

// overwrites equal keys
objectAssign({ foo: 0 }, { foo: 1 }, { foo: 2 });
//=> {foo: 2}

// ignores null and undefined sources
objectAssign({ foo: 0 }, null, { bar: 1 }, undefined);
//=> {foo: 0, bar: 1}
```

## API

### objectAssign(target, [source, ...])

Assigns enumerable own properties of `source` objects to the `target` object and returns the `target` object. Additional `source` objects will overwrite previous ones.

## Resources

- [ES2015 spec - Object.assign](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.assign)

## Related

- [deep-assign](https://github.com/sindresorhus/deep-assign) - Recursive `Object.assign()`

## License

MIT © [Sindre Sorhus](https://sindresorhus.com)
