كيف تختار صيغة الجمع الصحيحة للغات المختلفة؟

function formatFileCount(count) {
  return count === 1 ? `${count} file` : `${count} files`;
}

const rules = new Intl.PluralRules('en-US');
console.log(rules.select(0));  // "other"
console.log(rules.select(1));  // "one"
console.log(rules.select(2));  // "other"
console.log(rules.select(5));  // "other"

const rules = new Intl.PluralRules('pl-PL');
console.log(rules.select(0));   // "many"
console.log(rules.select(1));   // "one"
console.log(rules.select(2));   // "few"
console.log(rules.select(5));   // "many"
console.log(rules.select(22));  // "few"
console.log(rules.select(25));  // "many"

const rules = new Intl.PluralRules('ar-EG');
console.log(rules.select(0));   // "zero"
console.log(rules.select(1));   // "one"
console.log(rules.select(2));   // "two"
console.log(rules.select(3));   // "few"
console.log(rules.select(11));  // "many"
console.log(rules.select(100)); // "other"

const messages = {
  one: '{count} file',
  other: '{count} files'
};

function formatFileCount(count, locale) {
  const rules = new Intl.PluralRules(locale);
  const category = rules.select(count);
  const message = messages[category];
  return message.replace('{count}', count);
}

console.log(formatFileCount(1, 'en-US'));  // "1 file"
console.log(formatFileCount(5, 'en-US'));  // "5 files"

const messages = {
  one: '{count} plik',
  few: '{count} pliki',
  many: '{count} plików'
};

function formatFileCount(count, locale) {
  const rules = new Intl.PluralRules(locale);
  const category = rules.select(count);
  const message = messages[category];
  return message.replace('{count}', count);
}

console.log(formatFileCount(1, 'pl-PL'));   // "1 plik"
console.log(formatFileCount(2, 'pl-PL'));   // "2 pliki"
console.log(formatFileCount(5, 'pl-PL'));   // "5 plików"
console.log(formatFileCount(22, 'pl-PL'));  // "22 pliki"

function formatFileCount(count, locale, messages) {
  const rules = new Intl.PluralRules(locale);
  const category = rules.select(count);
  const message = messages[category] || messages.other;
  return message.replace('{count}', count);
}

const englishMessages = {
  one: '{count} file',
  other: '{count} files'
};

console.log(formatFileCount(1, 'en-US', englishMessages));  // "1 file"
console.log(formatFileCount(5, 'en-US', englishMessages));  // "5 files"

const cardinalRules = new Intl.PluralRules('en-US', { type: 'cardinal' });
console.log(cardinalRules.select(1));  // "one"
console.log(cardinalRules.select(2));  // "other"
console.log(cardinalRules.select(3));  // "other"

const ordinalRules = new Intl.PluralRules('en-US', { type: 'ordinal' });
console.log(ordinalRules.select(1));   // "one"
console.log(ordinalRules.select(2));   // "two"
console.log(ordinalRules.select(3));   // "few"
console.log(ordinalRules.select(4));   // "other"

const rules = new Intl.PluralRules('en-US');
console.log(rules.select(1));    // "one"
console.log(rules.select(1.0));  // "one"
console.log(rules.select(1.5));  // "other"
console.log(rules.select(0.5));  // "other"

const messages = {
  one: '{count} file',
  other: '{count} files'
};

const rules = new Intl.PluralRules('en-US');
const count = 1.5;
const category = rules.select(count);
const message = messages[category];
console.log(message.replace('{count}', count));  // "1.5 files"

class PluralFormatter {
  constructor(locale) {
    this.locale = locale;
    this.rules = new Intl.PluralRules(locale);
  }

  format(count, messages) {
    const category = this.rules.select(count);
    const message = messages[category] || messages.other;
    return message.replace('{count}', count);
  }
}

const formatter = new PluralFormatter('en-US');

const fileMessages = {
  one: '{count} file',
  other: '{count} files'
};

const itemMessages = {
  one: '{count} item',
  other: '{count} items'
};

console.log(formatter.format(1, fileMessages));  // "1 file"
console.log(formatter.format(5, fileMessages));  // "5 files"
console.log(formatter.format(1, itemMessages));  // "1 item"
console.log(formatter.format(3, itemMessages));  // "3 items"

const translations = {
  'en-US': {
    fileCount: {
      one: '{count} file',
      other: '{count} files'
    },
    downloadComplete: {
      one: 'Download of {count} file complete',
      other: 'Download of {count} files complete'
    }
  },
  'pl-PL': {
    fileCount: {
      one: '{count} plik',
      few: '{count} pliki',
      many: '{count} plików'
    },
    downloadComplete: {
      one: 'Pobieranie {count} pliku zakończone',
      few: 'Pobieranie {count} plików zakończone',
      many: 'Pobieranie {count} plików zakończone'
    }
  }
};

class Translator {
  constructor(locale, translations) {
    this.locale = locale;
    this.translations = translations[locale] || {};
    this.rules = new Intl.PluralRules(locale);
  }

  translate(key, count) {
    const messages = this.translations[key];
    if (!messages) return key;

    const category = this.rules.select(count);
    const message = messages[category] || messages.other;
    return message.replace('{count}', count);
  }
}

const translator = new Translator('en-US', translations);
console.log(translator.translate('fileCount', 1));         // "1 file"
console.log(translator.translate('fileCount', 5));         // "5 files"
console.log(translator.translate('downloadComplete', 1));  // "Download of 1 file complete"
console.log(translator.translate('downloadComplete', 5));  // "Download of 5 files complete"

const polishTranslator = new Translator('pl-PL', translations);
console.log(polishTranslator.translate('fileCount', 1));   // "1 plik"
console.log(polishTranslator.translate('fileCount', 2));   // "2 pliki"
console.log(polishTranslator.translate('fileCount', 5));   // "5 plików"

function getPluralCategories(locale) {
  const rules = new Intl.PluralRules(locale);
  const categories = new Set();

  for (let i = 0; i <= 100; i++) {
    categories.add(rules.select(i));
    categories.add(rules.select(i + 0.5));
  }

  return Array.from(categories).sort();
}

console.log(getPluralCategories('en-US'));  // ["one", "other"]
console.log(getPluralCategories('pl-PL'));  // ["few", "many", "one"]
console.log(getPluralCategories('ar-EG'));  // ["few", "many", "one", "other", "two", "zero"]