array-duplicated/README.md

Return an Array of duplicated values in a given Array

# array-duplicated

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Return duplicated values in a given `Array`

```javascript
arrayDuplicated(['a', 2, 'b', true, 'b', 12, 'b', true, ['a']]) //=> ['b', true];
```

## Installation

[Use](https://docs.npmjs.com/cli/install) [npm](https://docs.npmjs.com/getting-started/what-is-npm).

```
npm install array-duplicated
```

## API

```javascript
import arrayDuplicated from 'array-duplicated';
```

### arrayDuplicated(*array*)

*array*: `Array<any>`  
Return: `Array`

It finds duplicated values in the `Array` and returns an `Array` of them.

```javascript
arrayDuplicated([0, 1, 1, 1, 1, 1, 1, 1, 1, 1]); //=> [1]
```

"Duplicated" means a value is identical to another value in the ECMAScript [same-value equality](https://developer.mozilla.org/docs/Web/JavaScript/Equality_comparisons_and_sameness#Same-value_equality) level.

```javascript
arrayDuplicated([-1, 1]); //=> []
```

## License

[ISC License](./LICENSE) © 2017 - 2018 Shinnosuke Watanabe