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node_modules/object.assign/README.md
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r789 | #object.assign <sup>[![Version Badge][npm-version-svg]][npm-url]</sup> | |||
[![Build Status][travis-svg]][travis-url] | ||||
[![dependency status][deps-svg]][deps-url] | ||||
[![dev dependency status][dev-deps-svg]][dev-deps-url] | ||||
[![License][license-image]][license-url] | ||||
[![Downloads][downloads-image]][downloads-url] | ||||
[![npm badge][npm-badge-png]][npm-url] | ||||
[![browser support][testling-png]][testling-url] | ||||
An Object.assign shim. Invoke its "shim" method to shim Object.assign if it is unavailable. | ||||
This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](http://www.ecma-international.org/ecma-262/6.0/#sec-object.assign). In an ES6 environment, it will also work properly with `Symbol`s. | ||||
Takes a minimum of 2 arguments: `target` and `source`. | ||||
Takes a variable sized list of source arguments - at least 1, as many as you want. | ||||
Throws a TypeError if the `target` argument is `null` or `undefined`. | ||||
Most common usage: | ||||
```js | ||||
var assign = require('object.assign').getPolyfill(); // returns native method if compliant | ||||
/* or */ | ||||
var assign = require('object.assign/polyfill')(); // returns native method if compliant | ||||
``` | ||||
## Example | ||||
```js | ||||
var assert = require('assert'); | ||||
// Multiple sources! | ||||
var target = { a: true }; | ||||
var source1 = { b: true }; | ||||
var source2 = { c: true }; | ||||
var sourceN = { n: true }; | ||||
var expected = { | ||||
a: true, | ||||
b: true, | ||||
c: true, | ||||
n: true | ||||
}; | ||||
assign(target, source1, source2, sourceN); | ||||
assert.deepEqual(target, expected); // AWESOME! | ||||
``` | ||||
```js | ||||
var target = { | ||||
a: true, | ||||
b: true, | ||||
c: true | ||||
}; | ||||
var source1 = { | ||||
c: false, | ||||
d: false | ||||
}; | ||||
var sourceN = { | ||||
e: false | ||||
}; | ||||
var assigned = assign(target, source1, sourceN); | ||||
assert.equal(target, assigned); // returns the target object | ||||
assert.deepEqual(assigned, { | ||||
a: true, | ||||
b: true, | ||||
c: false, | ||||
d: false, | ||||
e: false | ||||
}); | ||||
``` | ||||
```js | ||||
/* when Object.assign is not present */ | ||||
delete Object.assign; | ||||
var shimmedAssign = require('object.assign').shim(); | ||||
/* or */ | ||||
var shimmedAssign = require('object.assign/shim')(); | ||||
assert.equal(shimmedAssign, assign); | ||||
var target = { | ||||
a: true, | ||||
b: true, | ||||
c: true | ||||
}; | ||||
var source = { | ||||
c: false, | ||||
d: false, | ||||
e: false | ||||
}; | ||||
var assigned = assign(target, source); | ||||
assert.deepEqual(Object.assign(target, source), assign(target, source)); | ||||
``` | ||||
```js | ||||
/* when Object.assign is present */ | ||||
var shimmedAssign = require('object.assign').shim(); | ||||
assert.equal(shimmedAssign, Object.assign); | ||||
var target = { | ||||
a: true, | ||||
b: true, | ||||
c: true | ||||
}; | ||||
var source = { | ||||
c: false, | ||||
d: false, | ||||
e: false | ||||
}; | ||||
assert.deepEqual(Object.assign(target, source), assign(target, source)); | ||||
``` | ||||
## Tests | ||||
Simply clone the repo, `npm install`, and run `npm test` | ||||
[npm-url]: https://npmjs.org/package/object.assign | ||||
[npm-version-svg]: http://versionbadg.es/ljharb/object.assign.svg | ||||
[travis-svg]: https://travis-ci.org/ljharb/object.assign.svg | ||||
[travis-url]: https://travis-ci.org/ljharb/object.assign | ||||
[deps-svg]: https://david-dm.org/ljharb/object.assign.svg?theme=shields.io | ||||
[deps-url]: https://david-dm.org/ljharb/object.assign | ||||
[dev-deps-svg]: https://david-dm.org/ljharb/object.assign/dev-status.svg?theme=shields.io | ||||
[dev-deps-url]: https://david-dm.org/ljharb/object.assign#info=devDependencies | ||||
[testling-png]: https://ci.testling.com/ljharb/object.assign.png | ||||
[testling-url]: https://ci.testling.com/ljharb/object.assign | ||||
[npm-badge-png]: https://nodei.co/npm/object.assign.png?downloads=true&stars=true | ||||
[license-image]: http://img.shields.io/npm/l/object.assign.svg | ||||
[license-url]: LICENSE | ||||
[downloads-image]: http://img.shields.io/npm/dm/object.assign.svg | ||||
[downloads-url]: http://npm-stat.com/charts.html?package=object.assign | ||||