everyutil/string/detectLanguage.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.detectLanguage = void 0;
/**
 * Returns the likely language of a string using simple heuristics.
 *
 * Example: detectLanguage("bonjour") → "fr"
 *
 * @author @dailker
 * @param {string} str - The input string.
 * @returns {string} ISO language code (e.g., 'en', 'fr', 'ru', 'zh', etc.)
 */
function detectLanguage(str) {
    if (/[а-яА-ЯЁё]/.test(str))
        return 'ru';
    if (/[àâçéèêëîïôûùüÿœæ]/i.test(str) || /\b(le|la|les|un|une|des|bonjour|merci)\b/i.test(str))
        return 'fr';
    if (/[äöüß]/i.test(str) || /\b(der|die|das|und|ist|ein)\b/i.test(str))
        return 'de';
    if (/[áéíóúñü]/i.test(str) || /\b(el|la|los|las|un|una|gracias|hola)\b/i.test(str))
        return 'es';
    if (/[\u3040-\u30ff]/.test(str))
        return 'ja';
    if (/[\u4e00-\u9fff]/.test(str))
        return 'zh';
    return 'en';
}
exports.detectLanguage = detectLanguage;