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# shallowequal [![Build Status](https://travis-ci.org/dashed/shallowequal.svg)](https://travis-ci.org/dashed/shallowequal) [![Downloads](https://img.shields.io/npm/dm/shallowequal.svg)](https://npmjs.com/shallowequal) [![npm version](https://img.shields.io/npm/v/shallowequal.svg?style=flat)](https://www.npmjs.com/package/shallowequal)

[![Greenkeeper badge](https://badges.greenkeeper.io/dashed/shallowequal.svg)](https://greenkeeper.io/)

> `shallowequal` is like lodash's [`isEqualWith`](https://lodash.com/docs/4.17.4#isEqualWith) but for shallow (strict) equal.

`shallowequal(value, other, [customizer], [thisArg])`

Performs a ***shallow equality*** comparison between two values (i.e. `value` and `other`) to determine if they are equivalent.

The equality is performed by iterating through keys on the given `value`, and returning `false` whenever any key has values which are not **strictly equal** between `value` and `other`. Otherwise, return `true` whenever the values of all keys are strictly equal.

If `customizer` (expected to be a function) is provided it is invoked to compare values. If `customizer` returns `undefined` (i.e. `void 0`), then comparisons are handled by the `shallowequal` function instead.

The `customizer` is bound to `thisArg` and invoked with three arguments: `(value, other, key)`.

**NOTE:** Docs are (shamelessly) adapted from [lodash's v3.x docs](https://lodash.com/docs/3.10.1#isEqualWith)

## Install

```sh
$ yarn add shallowequal
# npm v5+
$ npm install shallowequal
# before npm v5
$ npm install --save shallowequal
```

## Usage

```js
const shallowequal = require('shallowequal');

const object = { 'user': 'fred' };
const other = { 'user': 'fred' };

object == other;
// → false

shallowequal(object, other);
// → true
```

## Credit

Code for `shallowEqual` originated from https://github.com/gaearon/react-pure-render/ and has since been refactored to have the exact same API as `lodash.isEqualWith` (as of `v4.17.4`).

## Development

- `node.js` and `npm`. See: https://github.com/creationix/nvm#installation
- `yarn`. See: https://yarnpkg.com/en/docs/install
- `npm` dependencies. Run: `yarn install`

### Chores

- Lint: `yarn lint`
- Test: `yarn test`
- Pretty: `yarn pretty`
- Pre-publish: `yarn prepublish`

## License

MIT.