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sfcode An Online Competing and Development Environment

fill-range

Contributing

> 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, and consider starring the project to show your :heart: and support.

# Install

Install with npm:

$ 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)_.

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 to use.
- `options`: **{Object|Function}**: See all available options

# Examples

By default, an array of values is returned.

Alphabetical ranges

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.

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.

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)

// 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)

// 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:

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)

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)

// 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). _(you can also pass this function as the last argument to `fill()`)_.

Example(s)

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

# About

<details>

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

</details>

<details>

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:

$ npm install && npm test

</details>

<details>

Building docs

_(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)_

To generate the readme, run the following command:

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

</details>

## Contributors

Commits | Contributor
--- | ---
116 | jonschlinkert
4 | paulmillr
2 | realityking
2 | bluelovers
1 | edorivai
1 | wtgtybhertgeghgtwtg

## Author

Jon Schlinkert

- GitHub Profile
- Twitter Profile
- LinkedIn Profile

Please consider supporting me on Patreon, or start your own Patreon page!

## License

Copyright © 2019, Jon Schlinkert. Released under the [MIT License](LICENSE).

This file was generated by verb-generate-readme, v0.8.0, on April 08, 2019.