317 lines
8.8 KiB
Markdown
317 lines
8.8 KiB
Markdown
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# fill-range [](https://www.npmjs.com/package/fill-range) [](https://npmjs.org/package/fill-range) [](https://npmjs.org/package/fill-range) [](https://travis-ci.org/jonschlinkert/fill-range)
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> Fill in a range of numbers or letters, optionally passing an increment or multiplier to use.
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Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
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- [Install](#install)
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- [Usage](#usage)
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* [Invalid ranges](#invalid-ranges)
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* [Custom function](#custom-function)
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* [Special characters](#special-characters)
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+ [plus](#plus)
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+ [pipe and tilde](#pipe-and-tilde)
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+ [angle bracket](#angle-bracket)
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+ [question mark](#question-mark)
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- [About](#about)
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_(TOC generated by [verb](https://github.com/verbose/verb) using [markdown-toc](https://github.com/jonschlinkert/markdown-toc))_
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save fill-range
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```
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## Usage
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```js
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var range = require('fill-range');
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range('a', 'e');
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//=> ['a', 'b', 'c', 'd', 'e']
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```
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**Params**
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```js
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range(start, stop, step, options, fn);
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```
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* `start`: **{String|Number}** the number or letter to start with
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* `end`: **{String|Number}** the number or letter to end with
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* `step`: **{String|Number}** optionally pass the step to use. works for letters or numbers.
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* `options`: **{Object}**:
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- `makeRe`: return a regex-compatible string (still returned as an array for consistency)
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- `step`: pass the step on the options as an alternative to passing it as an argument
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- `silent`: `true` by default, set to false to throw errors for invalid ranges.
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* `fn`: **{Function}** optionally [pass a function](#custom-function) to modify each character
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**Examples**
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```js
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range(1, 3)
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//=> ['1', '2', '3']
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range('1', '3')
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//=> ['1', '2', '3']
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range('0', '-5')
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//=> [ '0', '-1', '-2', '-3', '-4', '-5' ]
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range(-9, 9, 3)
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//=> [ '-9', '-6', '-3', '0', '3', '6', '9' ])
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range('-1', '-10', '-2')
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//=> [ '-1', '-3', '-5', '-7', '-9' ]
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range('1', '10', '2')
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//=> [ '1', '3', '5', '7', '9' ]
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range('a', 'e')
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//=> ['a', 'b', 'c', 'd', 'e']
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range('a', 'e', 2)
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//=> ['a', 'c', 'e']
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range('A', 'E', 2)
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//=> ['A', 'C', 'E']
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```
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### Invalid ranges
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When an invalid range is passed, `null` is returned.
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```js
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range('1.1', '2');
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//=> null
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range('a', '2');
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//=> null
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range(1, 10, 'foo');
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//=> null
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```
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If you want errors to be throw, pass `silent: false` on the options:
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### Custom function
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Optionally pass a custom function as the third or fourth argument:
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```js
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range('a', 'e', function (val, isNumber, pad, i) {
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if (!isNumber) {
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return String.fromCharCode(val) + i;
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}
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return val;
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});
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//=> ['a0', 'b1', 'c2', 'd3', 'e4']
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```
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### Special characters
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A special character may be passed as the third arg instead of a step increment. These characters can be pretty useful for brace expansion, creating file paths, test fixtures and similar use case.
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```js
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range('a', 'z', SPECIAL_CHARACTER_HERE);
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```
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**Supported characters**
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* `+`: repeat the given string `n` times
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* `|`: create a regex-ready string, instead of an array
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* `>`: join values to single array element
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* `?`: randomize the given pattern using [randomatic]
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#### plus
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Character: _(`+`)_
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Repeat the first argument the number of times passed on the second argument.
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**Examples:**
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```js
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range('a', 3, '+');
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//=> ['a', 'a', 'a']
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range('abc', 2, '+');
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//=> ['abc', 'abc']
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```
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#### pipe and tilde
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Characters: _(`|` and `~`)_
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Creates a regex-capable string (either a logical `or` or a character class) from the expanded arguments.
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**Examples:**
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```js
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range('a', 'c', '|');
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//=> ['(a|b|c)'
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range('a', 'c', '~');
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//=> ['[a-c]'
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range('a', 'z', '|5');
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//=> ['(a|f|k|p|u|z)'
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```
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**Automatic separator correction**
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To avoid this error:
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> `Range out of order in character class`
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Fill-range detects invalid sequences and uses the correct syntax. For example:
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**invalid** (regex)
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If you pass these:
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```js
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range('a', 'z', '~5');
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// which would result in this
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//=> ['[a-f-k-p-u-z]']
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range('10', '20', '~');
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// which would result in this
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//=> ['[10-20]']
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```
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**valid** (regex)
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fill-range corrects them to this:
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```js
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range('a', 'z', '~5');
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//=> ['(a|f|k|p|u|z)'
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range('10', '20', '~');
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//=> ['(10-20)'
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```
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#### angle bracket
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Character: _(`>`)_
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Joins all values in the returned array to a single value.
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**Examples:**
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```js
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range('a', 'e', '>');
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//=> ['abcde']
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range('5', '8', '>');
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//=> ['5678']
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range('2', '20', '2>');
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//=> ['2468101214161820']
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```
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#### question mark
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Character: _(`?`)_
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Uses [randomatic] to generate randomized alpha, numeric, or alpha-numeric patterns based on the provided arguments.
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**Examples:**
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_(actual results would obviously be randomized)_
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Generate a 5-character, uppercase, alphabetical string:
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```js
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range('A', 5, '?');
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//=> ['NSHAK']
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```
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Generate a 5-digit random number:
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```js
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range('0', 5, '?');
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//=> ['36583']
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```
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Generate a 10-character alpha-numeric string:
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```js
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range('A0', 10, '?');
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//=> ['5YJD60VQNN']
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```
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See the [randomatic] repo for all available options and or to create issues or feature requests related to randomization.
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## About
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<details>
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<summary><strong>Contributing</strong></summary>
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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</details>
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<details>
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<summary><strong>Running Tests</strong></summary>
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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:
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```sh
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$ npm install && npm test
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```
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</details>
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<details>
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<summary><strong>Building docs</strong></summary>
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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</details>
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### Related projects
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You might also be interested in these projects:
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* [braces](https://www.npmjs.com/package/braces): Bash-like brace expansion, implemented in JavaScript. Safer than other brace expansion libs, with complete support… [more](https://github.com/micromatch/braces) | [homepage](https://github.com/micromatch/braces "Bash-like brace expansion, implemented in JavaScript. Safer than other brace expansion libs, with complete support for the Bash 4.3 braces specification, without sacrificing speed.")
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* [expand-range](https://www.npmjs.com/package/expand-range): Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. Used… [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. Used by [micromatch].")
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* [is-glob](https://www.npmjs.com/package/is-glob): Returns `true` if the given string looks like a glob pattern or an extglob pattern… [more](https://github.com/jonschlinkert/is-glob) | [homepage](https://github.com/jonschlinkert/is-glob "Returns `true` if the given string looks like a glob pattern or an extglob pattern. This makes it easy to create code that only uses external modules like node-glob when necessary, resulting in much faster code execution and initialization time, and a bet")
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* [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/micromatch/micromatch "Glob matching for javascript/node.js. A drop-in replacement and faster alternative to minimatch and multimatch.")
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 111 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 2 | [paulmillr](https://github.com/paulmillr) |
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| 1 | [edorivai](https://github.com/edorivai) |
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| 1 | [realityking](https://github.com/realityking) |
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| 1 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
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### Author
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**Jon Schlinkert**
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* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)
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* [GitHub Profile](https://github.com/jonschlinkert)
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* [Twitter Profile](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on May 08, 2018._
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