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JavaScript Intl ListFormat supportedLocalesOf() Method

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The Intl.ListFormat.supportedLocalesOf() method is an inbuilt method in JavaScript that returns an array containing those of the provided locales that are supported in list formatting.

Syntax: 

Intl.ListFormat.supportedLocalesOf(locales, options)

Parameters: This method accepts two parameters as mentioned above and described below: 

  • locales: This parameter holds a string with a BCP 47 language tag or an array of such strings.
  • options: It is an optional parameter. It is an object that has localeMatcher property. localeMatcher is the locale-matching algorithm to use. It has the values “lookup” and “best fit”.

Return value: This method returns an array of strings representing the subset of the given locale tags that are supported in list formatting.

The below examples illustrate the Intl.ListFormat.supportedLocalesOf() method in JavaScript:

Example 1: In this example, we will see the basic use of the Intl.ListFormat.supportedLocalesOf() method in JavaScript.

javascript




<script>
    const geeks = ['ban', 'id-u-co-pinyin', 'de-ID'];
    const result = { localeMatcher: 'lookup' };
    let val = Intl.ListFormat.supportedLocalesOf(geeks, result).join(', ');
    console.log(val);
</script>


Output: 

"id-u-co-pinyin, de-ID"

Example 2: In this example, we will see the basic use of the Intl.ListFormat.supportedLocalesOf() method in JavaScript.

javascript




<script>
    const geeks = ['ban', 'id-u-co-pinyin', 'de-ID'];
    let val = Intl.ListFormat.supportedLocalesOf(geeks).join(', ');
    console.log(val);
</script>


Output: 

"id-u-co-pinyin, de-ID"

We have a complete list of Javascript Intl methods, to check those please go through the Javascript Intl Complete Reference article.

Supported Browsers: The browsers supported by Intl.ListFormat.supportedLocalesOf() method are listed below: 

  • Google Chrome 72 and above
  • Edge 79 and above
  • Firefox 78 and above
  • Opera 60 and above
  • Safari 14.1 and above

Last Updated : 25 May, 2023
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