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[Build]: http://img.shields.io/travis/litejs/natural-compare-lite.png
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[Coverage]: http://img.shields.io/coveralls/litejs/natural-compare-lite.png
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[1]: https://travis-ci.org/litejs/natural-compare-lite
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[2]: https://coveralls.io/r/litejs/natural-compare-lite
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[npm package]: https://npmjs.org/package/natural-compare-lite
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[GitHub repo]: https://github.com/litejs/natural-compare-lite
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@version 1.4.0
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@date 2015-10-26
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@stability 3 - Stable
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Natural Compare – [![Build][]][1] [![Coverage][]][2]
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===============
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Compare strings containing a mix of letters and numbers
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in the way a human being would in sort order.
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This is described as a "natural ordering".
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```text
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Standard sorting: Natural order sorting:
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img1.png img1.png
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img10.png img2.png
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img12.png img10.png
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img2.png img12.png
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```
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String.naturalCompare returns a number indicating
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whether a reference string comes before or after or is the same
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as the given string in sort order.
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Use it with builtin sort() function.
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### Installation
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- In browser
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```html
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<script src=min.natural-compare.js></script>
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```
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- In node.js: `npm install natural-compare-lite`
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```javascript
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require("natural-compare-lite")
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```
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### Usage
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```javascript
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// Simple case sensitive example
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var a = ["z1.doc", "z10.doc", "z17.doc", "z2.doc", "z23.doc", "z3.doc"];
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a.sort(String.naturalCompare);
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// ["z1.doc", "z2.doc", "z3.doc", "z10.doc", "z17.doc", "z23.doc"]
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// Use wrapper function for case insensitivity
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a.sort(function(a, b){
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return String.naturalCompare(a.toLowerCase(), b.toLowerCase());
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})
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// In most cases we want to sort an array of objects
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var a = [ {"street":"350 5th Ave", "room":"A-1021"}
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, {"street":"350 5th Ave", "room":"A-21046-b"} ];
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// sort by street, then by room
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a.sort(function(a, b){
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return String.naturalCompare(a.street, b.street) || String.naturalCompare(a.room, b.room);
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})
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// When text transformation is needed (eg toLowerCase()),
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// it is best for performance to keep
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// transformed key in that object.
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// There are no need to do text transformation
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// on each comparision when sorting.
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var a = [ {"make":"Audi", "model":"A6"}
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, {"make":"Kia", "model":"Rio"} ];
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// sort by make, then by model
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a.map(function(car){
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car.sort_key = (car.make + " " + car.model).toLowerCase();
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})
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a.sort(function(a, b){
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return String.naturalCompare(a.sort_key, b.sort_key);
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})
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```
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- Works well with dates in ISO format eg "Rev 2012-07-26.doc".
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### Custom alphabet
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It is possible to configure a custom alphabet
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to achieve a desired order.
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```javascript
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// Estonian alphabet
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String.alphabet = "ABDEFGHIJKLMNOPRSŠZŽTUVÕÄÖÜXYabdefghijklmnoprsšzžtuvõäöüxy"
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["t", "z", "x", "õ"].sort(String.naturalCompare)
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// ["z", "t", "õ", "x"]
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// Russian alphabet
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String.alphabet = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя"
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["Ё", "А", "Б"].sort(String.naturalCompare)
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// ["А", "Б", "Ё"]
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```
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External links
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--------------
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- [GitHub repo][https://github.com/litejs/natural-compare-lite]
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- [jsperf test](http://jsperf.com/natural-sort-2/12)
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Licence
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-------
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Copyright (c) 2012-2015 Lauri Rooden <lauri@rooden.ee>
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[The MIT License](http://lauri.rooden.ee/mit-license.txt)
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