The Intl.Collator.prototype.compare property returns a function that compares two strings according to the sort order of this Collator object.

Syntax

collator.compare(string1, string2)

Parameters

string1
string2
The strings to compare against each other.

Description

The function returned by the compare getter returns a number indicating how string1 and string2 compare to each other according to the sort order of this Collator object: a negative value if string1 comes before string2; a positive value if string1 comes after string2; 0 if they are considered equal.

Examples

Using compare for array sort

Use the function returned by the compare getter for sorting arrays. Note that the function is bound to the collator from which it was obtained, so it can be passed directly to Array.prototype.sort().

var a = ['Offenbach', 'Österreich', 'Odenwald'];
var collator = new Intl.Collator('de-u-co-phonebk');
a.sort(collator.compare);
console.log(a.join(', '));
// → "Odenwald, Österreich, Offenbach"

Use the function returned by the compare getter for finding matching strings in arrays:

var a = ['Congrès', 'congres', 'Assemblée', 'poisson'];
var collator = new Intl.Collator('fr', { usage: 'search', sensitivity: 'base' });
var s = 'congres';
var matches = a.filter(v => collator.compare(v, s) === 0);
console.log(matches.join(', '));
// → "Congrès, congres"

Specifications

Specification Status Comment
ECMAScript Internationalization API 1.0 (ECMA-402)
The definition of 'Intl.Collator.prototype.compare' in that specification.
Standard Initial definition.
ECMAScript Internationalization API 2.0 (ECMA-402)
The definition of 'Intl.Collator.prototype.compare' in that specification.
Standard  
ECMAScript Internationalization API 4.0 (ECMA-402)
The definition of 'Intl.Collator.prototype.compare' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 24Edge Full support YesFirefox Full support 29IE Full support 11Opera Full support 15Safari Full support 10WebView Android No support NoChrome Android Full support 26Edge Mobile Full support YesFirefox Android Full support 56Opera Android ? Safari iOS Full support 10Samsung Internet Android Full support Yesnodejs ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Last updated by: scottb,