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[Build]:    http://img.shields.io/travis/litejs/natural-compare-lite.png
[Coverage]: http://img.shields.io/coveralls/litejs/natural-compare-lite.png
[1]: https://travis-ci.org/litejs/natural-compare-lite
[2]: https://coveralls.io/r/litejs/natural-compare-lite
[npm package]: https://npmjs.org/package/natural-compare-lite
[GitHub repo]: https://github.com/litejs/natural-compare-lite

@version    1.4.0
    @date       2015-10-26
    @stability  3 - Stable

Natural Compare &ndash; [![Build][]][1] [![Coverage][]][2]
===============

Compare strings containing a mix of letters and numbers
in the way a human being would in sort order.
This is described as a "natural ordering".

```text
Standard sorting:   Natural order sorting:
    img1.png            img1.png
    img10.png           img2.png
    img12.png           img10.png
    img2.png            img12.png
```

String.naturalCompare returns a number indicating
whether a reference string comes before or after or is the same
as the given string in sort order.
Use it with builtin sort() function.

### Installation

- In browser

```html
<script src=min.natural-compare.js></script>
```

- In node.js: `npm install natural-compare-lite`

```javascript
require("natural-compare-lite")
```

### Usage

```javascript
// Simple case sensitive example
var a = ["z1.doc", "z10.doc", "z17.doc", "z2.doc", "z23.doc", "z3.doc"];
a.sort(String.naturalCompare);
// ["z1.doc", "z2.doc", "z3.doc", "z10.doc", "z17.doc", "z23.doc"]

// Use wrapper function for case insensitivity
a.sort(function(a, b){
  return String.naturalCompare(a.toLowerCase(), b.toLowerCase());
})

// In most cases we want to sort an array of objects
var a = [ {"street":"350 5th Ave", "room":"A-1021"}
        , {"street":"350 5th Ave", "room":"A-21046-b"} ];

// sort by street, then by room
a.sort(function(a, b){
  return String.naturalCompare(a.street, b.street) || String.naturalCompare(a.room, b.room);
})

// When text transformation is needed (eg toLowerCase()),
// it is best for performance to keep
// transformed key in that object.
// There are no need to do text transformation
// on each comparision when sorting.
var a = [ {"make":"Audi", "model":"A6"}
        , {"make":"Kia",  "model":"Rio"} ];

// sort by make, then by model
a.map(function(car){
  car.sort_key = (car.make + " " + car.model).toLowerCase();
})
a.sort(function(a, b){
  return String.naturalCompare(a.sort_key, b.sort_key);
})
```

- Works well with dates in ISO format eg "Rev 2012-07-26.doc".

### Custom alphabet

It is possible to configure a custom alphabet
to achieve a desired order.

```javascript
// Estonian alphabet
String.alphabet = "ABDEFGHIJKLMNOPRSŠZŽTUVÕÄÖÜXYabdefghijklmnoprsšzžtuvõäöüxy"
["t", "z", "x", "õ"].sort(String.naturalCompare)
// ["z", "t", "õ", "x"]

// Russian alphabet
String.alphabet = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя"
["Ё", "А", "Б"].sort(String.naturalCompare)
// ["А", "Б", "Ё"]
```

External links
--------------

-   [GitHub repo][]
-   [npm package][]
-   [jsperf test](http://jsperf.com/natural-sort-2/12)

Licence
-------

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