Introduction to Language Detect

Language detection is a crucial component in modern software applications. Whether you are trying to guess the language of a document, detect multiple languages on a webpage, or filter content by language, a reliable language detection library can be highly valuable. language-detect is one such library that provides powerful features for language identification across various applications.

Key Features of Language Detect

The language-detect library comes packed with numerous APIs to help you achieve different language identification tasks. Below are some of the useful APIs with examples to help you get started:

1. Basic Language Detection

Use this API to detect the language of a given text:

import LanguageDetect from 'language-detect';

const detector = new LanguageDetect();
const languages = detector.detect('This is a simple test.');
console.log(languages);
// Output: [{ language: 'English', percent: 100 }]

2. Detecting Multiple Languages

If you need to detect multiple languages within a text, use the following API:

const multiLangText = 'This is a simple test. Cela semble bon. Esto es genial.';
const multiLangDetection = detector.detectAll(multiLangText);
console.log(multiLangDetection);
// Output: [ { language: 'English', percent: 50 }, { language: 'French', percent: 30 }, { language: 'Spanish', percent: 20 }]

3. Supported Languages

You can get a list of supported languages by the library:

const supportedLanguages = detector.getLanguages();
console.log(supportedLanguages);
// Output: [ 'English', 'French', 'Spanish', 'German', ... ]

4. Custom Language Profiles

Sometimes, you might want to add or customize language profiles. Here is how you can do that:

const customProfile = {
  name: 'CustomLang',
  frequency: { ... },
  unicode: { ... }
};
detector.addProfile(customProfile);
// Now the custom language is part of the detection process

5. Language Detection with Confidence Score

Get the most probable language with confidence scores:

const detectionWithConfidence = detector.detect('Dies ist ein Test.');
console.log(detectionWithConfidence);
// Output: [{ language: 'German', percent: 100 }]

Application Example

To put it all together, let’s consider an example of a multilingual content filter application where we leverage the language-detect library for language identification:

import LanguageDetect from 'language-detect';

const detector = new LanguageDetect();

// Sample content
const contents = [
  'Hello, this is an English content.',
  'Bonjour, ceci est un contenu français.',
  'Hola, este es un contenido en español.'
];

// Function to filter languages
const filterContentByLanguage = (contents, language) => {
  return contents.filter(content => {
    const detectedLanguages = detector.detect(content);
    return detectedLanguages.some(langObj => langObj.language === language);
  });
};

// Filtering English content
const englishContents = filterContentByLanguage(contents, 'English');
console.log(englishContents);
// Output: ['Hello, this is an English content.']

By integrating the language-detect library in our application, we can readily identify and filter content based on various languages, thus making our application more versatile and user-friendly.

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