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- # fill-range [![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`
-
- ## Table of Contents
-
- - [Install](#install)
- - [Usage](#usage)
- - [Examples](#examples)
- - [Options](#options)
- * [options.step](#optionsstep)
- * [options.strictRanges](#optionsstrictranges)
- * [options.stringify](#optionsstringify)
- * [options.toRegex](#optionstoregex)
- * [options.transform](#optionstransform)
- - [About](#about)
-
- _(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
-
- ## Install
-
- Install with [npm](https://www.npmjs.com/):
-
- ```sh
- $ npm install --save fill-range
- ```
-
- Install with [yarn](https://yarnpkg.com):
-
- ```sh
- $ yarn add 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
- var fill = require('fill-range');
- fill(from, to[, step, options]);
-
- // examples
- 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
- // increase padding by two
- var arr = fill('01', '05', function(val, a, b, step, idx, arr, options) {
- return repeat('0', (options.maxLength + 2) - val.length) + val;
- });
-
- console.log(arr);
- //=> ['0001', '0002', '0003', '0004', '0005']
- ```
-
- ## About
-
- ### Related projects
-
- * [braces](https://www.npmjs.com/package/braces): Fast, comprehensive, bash-like brace expansion implemented in JavaScript. Complete support for the Bash 4.3 braces… [more](https://github.com/jonschlinkert/braces) | [homepage](https://github.com/jonschlinkert/braces "Fast, comprehensive, bash-like brace expansion implemented in JavaScript. Complete support for the Bash 4.3 braces specification, without sacrificing speed.")
- * [expand-range](https://www.npmjs.com/package/expand-range): Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See… [more](https://github.com/jonschlinkert/expand-range) | [homepage](https://github.com/jonschlinkert/expand-range "Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See the benchmarks. Used by micromatch.")
- * [micromatch](https://www.npmjs.com/package/micromatch): Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch. | [homepage](https://github.com/jonschlinkert/micromatch "Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch.")
- * [to-regex-range](https://www.npmjs.com/package/to-regex-range): Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than… [more](https://github.com/jonschlinkert/to-regex-range) | [homepage](https://github.com/jonschlinkert/to-regex-range "Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.87 million test assertions.")
-
- ### Contributing
-
- Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
-
- ### Contributors
-
- | **Commits** | **Contributor** |
- | --- | --- |
- | 103 | [jonschlinkert](https://github.com/jonschlinkert) |
- | 2 | [paulmillr](https://github.com/paulmillr) |
- | 1 | [edorivai](https://github.com/edorivai) |
- | 1 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
-
- ### Building docs
-
- _(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
- ```
-
- ### Running tests
-
- 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
- ```
-
- ### Author
-
- **Jon Schlinkert**
-
- * [github/jonschlinkert](https://github.com/jonschlinkert)
- * [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
-
- ### License
-
- Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
- Released under the [MIT License](LICENSE).
-
- ***
-
- _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 23, 2017._
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