145 lines
4.3 KiB
Markdown
145 lines
4.3 KiB
Markdown
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# expand-range [](https://www.npmjs.com/package/expand-range) [](https://npmjs.org/package/expand-range) [](https://travis-ci.org/jonschlinkert/expand-range)
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Fast, bash-like range expansion. Expand a range of numbers or letters, uppercase or lowercase. See the benchmarks. Used by micromatch.
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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 expand-range --save
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```
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Wraps [fill-range] to do range expansion using `..` separated strings. See [fill-range] for the full list of options and features.
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## Example usage
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```js
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var expand = require('expand-range');
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```
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**Params**
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```js
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expand(start, stop, increment);
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```
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* `start`: the number or letter to start with
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* `end`: the number or letter to end with
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* `increment`: optionally pass the increment to use. works for letters or numbers
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**Examples**
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```js
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expand('a..e')
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//=> ['a', 'b', 'c', 'd', 'e']
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expand('a..e..2')
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//=> ['a', 'c', 'e']
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expand('A..E..2')
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//=> ['A', 'C', 'E']
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expand('1..3')
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//=> ['1', '2', '3']
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expand('0..-5')
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//=> [ '0', '-1', '-2', '-3', '-4', '-5' ]
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expand('-9..9..3')
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//=> [ '-9', '-6', '-3', '0', '3', '6', '9' ])
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expand('-1..-10..-2')
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//=> [ '-1', '-3', '-5', '-7', '-9' ]
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expand('1..10..2')
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//=> [ '1', '3', '5', '7', '9' ]
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```
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### Custom function
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Optionally pass a custom function as the second argument:
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```js
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expand('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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## Benchmarks
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```sh
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# benchmark/fixtures/alpha-lower.js (29 bytes)
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brace-expansion x 145,653 ops/sec ±0.89% (87 runs sampled)
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expand-range x 453,213 ops/sec ±1.66% (85 runs sampled)
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minimatch x 152,193 ops/sec ±1.17% (86 runs sampled)
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# benchmark/fixtures/alpha-upper.js (29 bytes)
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brace-expansion x 149,975 ops/sec ±1.10% (88 runs sampled)
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expand-range x 459,390 ops/sec ±1.27% (84 runs sampled)
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minimatch x 155,253 ops/sec ±1.25% (88 runs sampled)
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# benchmark/fixtures/padded.js (33 bytes)
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brace-expansion x 14,694 ops/sec ±1.37% (85 runs sampled)
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expand-range x 169,393 ops/sec ±1.76% (80 runs sampled)
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minimatch x 15,052 ops/sec ±1.15% (88 runs sampled)
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# benchmark/fixtures/range.js (29 bytes)
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brace-expansion x 142,968 ops/sec ±1.35% (86 runs sampled)
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expand-range x 465,579 ops/sec ±1.43% (86 runs sampled)
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minimatch x 126,872 ops/sec ±1.18% (90 runs sampled)
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```
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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): Fastest brace expansion for node.js, with the most complete support for the Bash 4.3 braces… [more](https://www.npmjs.com/package/braces) | [homepage](https://github.com/jonschlinkert/braces)
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* [fill-range](https://www.npmjs.com/package/fill-range): Fill in a range of numbers or letters, optionally passing an increment or multiplier to… [more](https://www.npmjs.com/package/fill-range) | [homepage](https://github.com/jonschlinkert/fill-range)
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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/jonschlinkert/micromatch)
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## Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/expand-range/issues/new).
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## Building docs
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Generate readme and API documentation with [verb](https://github.com/verbose/verb):
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```sh
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$ npm install verb && npm run docs
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```
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Or, if [verb](https://github.com/verbose/verb) is installed globally:
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```sh
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$ verb
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```
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## Running tests
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Install dev dependencies:
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```sh
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$ npm install -d && npm test
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```
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## Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](http://twitter.com/jonschlinkert)
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## License
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Copyright © 2016, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT license](https://github.com/jonschlinkert/expand-range/blob/master/LICENSE).
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***
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_This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on May 05, 2016._
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