natural-compare
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natural-compare

Compare strings containing a mix of letters and numbers in the way a human being would in sort order.

1.4.0  •  Updated 4 years ago  •  by litejs  •  MIT License

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

Natural Compare – Build Coverage

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”.

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
<script src=min.natural-compare.js></script>
  • In node.js: npm install natural-compare-lite
require("natural-compare-lite")

Usage

// 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.

// 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

Licence

Copyright © 2012-2015 Lauri Rooden <lauri@rooden.ee>
The MIT License

Popularity

Weekly Downloads
5.8M
Stars
50

Maintenance

Development

Last ver 4 years ago
Created 5 years ago
Last commit 4 years ago
20 days between commits

Technology

Node version: 6.2.2
0 unpacked

Compliance

MIT License
OSI Approved
0 vulnerabilities

Contributors

3 contributors
Lauri Rooden
Maintainer, 46 commits, 2 merges
Matias Dumrauf
1 commits, 1 PRs
Works at southworkscom
billybonks
1 commits, 1 PRs
Works at tradegecko
TrySound
1 PRs
isamuelson
1 PRs

Dependencies

Tags

string
natural
order
sort
natsort
natcmp
compare
alphanum
litejs
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