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//lib/node_modules/pm2/node_modules/fill-range/README.md

# fill-range [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W8YFZ425KND68) [![NPM version](https://img.shields.io/npm/v/fill-range.svg?style=flat)](https://www.npmjs.com/package/fill-range) [![NPM monthly downloads](https://img.shields.io/npm/dm/fill-range.svg?style=flat)](https://npmjs.org/package/fill-range) [![NPM total downloads](https://img.shields.io/npm/dt/fill-range.svg?style=flat)](https://npmjs.org/package/fill-range) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/fill-range.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/fill-range)

> Fill in a range of numbers or letters, optionally passing an increment or `step` to use, or create a regex-compatible range with `options.toRegex`

Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.

## Install

Install with [npm](https://www.npmjs.com/):

```sh
$ npm install --save fill-range
```

## Usage

Expands numbers and letters, optionally using a `step` as the last argument. _(Numbers may be defined as JavaScript numbers or strings)_.

```js
const fill = require('fill-range');
// fill(from, to[, step, options]);

console.log(fill('1', '10')); //=> ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
console.log(fill('1', '10', { toRegex: true })); //=> [1-9]|10
```

**Params**

* `from`: **{String|Number}** the number or letter to start with
* `to`: **{String|Number}** the number or letter to end with
* `step`: **{String|Number|Object|Function}** Optionally pass a [step](#optionsstep) to use.
* `options`: **{Object|Function}**: See all available [options](#options)

## Examples

By default, an array of values is returned.

**Alphabetical ranges**

```js
console.log(fill('a', 'e')); //=> ['a', 'b', 'c', 'd', 'e']
console.log(fill('A', 'E')); //=> [ 'A', 'B', 'C', 'D', 'E' ]
```

**Numerical ranges**

Numbers can be defined as actual numbers or strings.

```js
console.log(fill(1, 5));     //=> [ 1, 2, 3, 4, 5 ]
console.log(fill('1', '5')); //=> [ 1, 2, 3, 4, 5 ]
```

**Negative ranges**

Numbers can be defined as actual numbers or strings.

```js
console.log(fill('-5', '-1')); //=> [ '-5', '-4', '-3', '-2', '-1' ]
console.log(fill('-5', '5')); //=> [ '-5', '-4', '-3', '-2', '-1', '0', '1', '2', '3', '4', '5' ]
```

**Steps (increments)**

```js
// numerical ranges with increments
console.log(fill('0', '25', 4)); //=> [ '0', '4', '8', '12', '16', '20', '24' ]
console.log(fill('0', '25', 5)); //=> [ '0', '5', '10', '15', '20', '25' ]
console.log(fill('0', '25', 6)); //=> [ '0', '6', '12', '18', '24' ]

// alphabetical ranges with increments
console.log(fill('a', 'z', 4)); //=> [ 'a', 'e', 'i', 'm', 'q', 'u', 'y' ]
console.log(fill('a', 'z', 5)); //=> [ 'a', 'f', 'k', 'p', 'u', 'z' ]
console.log(fill('a', 'z', 6)); //=> [ 'a', 'g', 'm', 's', 'y' ]
```

## Options

### options.step

**Type**: `number` (formatted as a string or number)

**Default**: `undefined`

**Description**: The increment to use for the range. Can be used with letters or numbers.

**Example(s)**

```js
// numbers
console.log(fill('1', '10', 2)); //=> [ '1', '3', '5', '7', '9' ]
console.log(fill('1', '10', 3)); //=> [ '1', '4', '7', '10' ]
console.log(fill('1', '10', 4)); //=> [ '1', '5', '9' ]

// letters
console.log(fill('a', 'z', 5)); //=> [ 'a', 'f', 'k', 'p', 'u', 'z' ]
console.log(fill('a', 'z', 7)); //=> [ 'a', 'h', 'o', 'v' ]
console.log(fill('a', 'z', 9)); //=> [ 'a', 'j', 's' ]
```

### options.strictRanges

**Type**: `boolean`

**Default**: `false`

**Description**: By default, `null` is returned when an invalid range is passed. Enable this option to throw a `RangeError` on invalid ranges.

**Example(s)**

The following are all invalid:

```js
fill('1.1', '2');   // decimals not supported in ranges
fill('a', '2');     // incompatible range values
fill(1, 10, 'foo'); // invalid "step" argument
```

### options.stringify

**Type**: `boolean`

**Default**: `undefined`

**Description**: Cast all returned values to strings. By default, integers are returned as numbers.

**Example(s)**

```js
console.log(fill(1, 5));                    //=> [ 1, 2, 3, 4, 5 ]
console.log(fill(1, 5, { stringify: true })); //=> [ '1', '2', '3', '4', '5' ]
```

### options.toRegex

**Type**: `boolean`

**Default**: `undefined`

**Description**: Create a regex-compatible source string, instead of expanding values to an array.

**Example(s)**

```js
// alphabetical range
console.log(fill('a', 'e', { toRegex: true })); //=> '[a-e]'
// alphabetical with step
console.log(fill('a', 'z', 3, { toRegex: true })); //=> 'a|d|g|j|m|p|s|v|y'
// numerical range
console.log(fill('1', '100', { toRegex: true })); //=> '[1-9]|[1-9][0-9]|100'
// numerical range with zero padding
console.log(fill('000001', '100000', { toRegex: true }));
//=> '0{5}[1-9]|0{4}[1-9][0-9]|0{3}[1-9][0-9]{2}|0{2}[1-9][0-9]{3}|0[1-9][0-9]{4}|100000'
```

### options.transform

**Type**: `function`

**Default**: `undefined`

**Description**: Customize each value in the returned array (or [string](#optionstoRegex)). _(you can also pass this function as the last argument to `fill()`)_.

**Example(s)**

```js
// add zero padding
console.log(fill(1, 5, value => String(value).padStart(4, '0')));
//=> ['0001', '0002', '0003', '0004', '0005']
```

## About

<details>
<summary>Contributing</summary>

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

</details>

<details>
<summary>Running Tests</summary>

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

```sh
$ npm install && npm test
```

</details>

<details>
<summary>Building docs</summary>

_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_

To generate the readme, run the following command:

```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```

</details>

### Contributors

| **Commits** | **Contributor** |  
| --- | --- |  
| 116 | [jonschlinkert](https://github.com/jonschlinkert) |  
| 4   | [paulmillr](https://github.com/paulmillr) |  
| 2   | [realityking](https://github.com/realityking) |  
| 2   | [bluelovers](https://github.com/bluelovers) |  
| 1   | [edorivai](https://github.com/edorivai) |  
| 1   | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |

### Author

**Jon Schlinkert**

* [GitHub Profile](https://github.com/jonschlinkert)
* [Twitter Profile](https://twitter.com/jonschlinkert)
* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)

Please consider supporting me on Patreon, or [start your own Patreon page](https://patreon.com/invite/bxpbvm)!

### License

***

_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on April 08, 2019._