# @bemoje/arr-index-of-first-where

Return the index of the first element of an array where the callback returns true. Returns -1 if none do.

#### Version

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#### Travis CI

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#### Dependencies

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## Installation

```sh
npm install @bemoje/arr-index-of-first-where
npm install --save @bemoje/arr-index-of-first-where
npm install --save-dev @bemoje/arr-index-of-first-where
```

## Usage

```javascript
import arrIndexOfFirstWhere from '@bemoje/arr-index-of-first-where'

const arr = [1, 2, 3, 4, 5]

arrIndexOfFirstWhere(arr, (element) => {
	return element >= 3
})
//=> 2

arrIndexOfFirstWhere(arr, (element) => {
	return element >= 6
})
//=> -1

```


## Tests
Uses *Jest* to test module functionality. Run tests to get coverage details.

```bash
npm run test
```

## API
### arrIndexOfFirstWhere

Return the index of the first element of an array where the callback returns true. Returns -1 if none do.

##### Parameters

- `arr` **[Array][5]** The array to iterate

- `callback` **[predicate][6]** The callback(element, index, array): boolean

##### Returns
**any** The first element to satisfy the condition

## predicate

Type: [Function][7]

##### Parameters

- `element` **any** The current array element

- `index` **[number][8]** The current index

- `array` **[Array][5]** The array being itereated

##### Returns
**[boolean][9]** 

[1]: #arrindexoffirstwhere

[2]: #parameters

[3]: #predicate

[4]: #parameters-1

[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array

[6]: #predicate

[7]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/function

[8]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

[9]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean

Return the index of the first element of an array where the callback returns true. Returns -1 if none do. 

@bemoje/arr-index-of-first-where

Return the index of the first element of an array where the callback returns true. Returns -1 if none do.

bemoje

arr-index-of-first-where

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@bemoje/arr-index-of-first-where