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

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Install

Install with npm:

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

$3

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' ]
`

$3

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
`

$3

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' ]
`

$3

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'
`

$3

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)

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

About

$3

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

$3

Jon Schlinkert

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Copyright © 2019, Jon Schlinkert.
Released under the MIT License.

*

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