Overview

The isSameLanguage function checks whether multiple BCP‑47 locale codes represent the same base language, ignoring regional differences.

Reference

Parameters

Returns

boolean — true if all locale codes represent the same base language

Examples

import { isSameLanguage } from 'generaltranslation';

// Same language, different regions
console.log(isSameLanguage('en-US', 'en-GB')); // true
console.log(isSameLanguage('es-ES', 'es-MX')); // true
console.log(isSameLanguage('zh-CN', 'zh-TW')); // true

// Different languages
console.log(isSameLanguage('en-US', 'es-ES')); // false
console.log(isSameLanguage('fr-FR', 'de-DE')); // false

Notes

• Compares only base language codes (before the first hyphen)
• Ignores regional, script, and variant differences
• Essential for language-based content organisation
• Works with a variable number of parameters

Next steps

• Use the GT class method isSameLanguage
• Compare dialects with isSameDialect