README.md 8.7KB
fill-range 
Fill in a range of numbers or letters, optionally passing an increment or
stepto use, or create a regex-compatible range withoptions.toRegex
Table of Contents
(TOC generated by verb using markdown-toc)
Install
Install with npm:
$ npm install --save fill-range
Install with yarn:
$ 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).
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 withto: {String|Number} the number or letter to end withstep: {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)
// 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
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Contributing
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
Contributors
| Commits | Contributor |
| --- | --- |
| 103 | jonschlinkert |
| 2 | paulmillr |
| 1 | edorivai |
| 1 | wtgtybhertgeghgtwtg |
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
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
Author
Jon Schlinkert
License
Copyright © 2017, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.5.0, on April 23, 2017.