number_to_words_english

📚 Documentation Updates & Compatibility Improvements

📝 README Synchronization

• Updated dependency version: Changed installation guide from ^3.0.0 to ^3.0.3
• Accurate test count: Updated from "145+ tests" to precise "147 tests"
• Added recent improvements: Highlighted Vietnamese, Russian, Arabic grammar fixes
• Added code quality notes: Mentioned Dart formatting compliance improvements
• Version consistency: All documentation now matches actual package version

📱 Broader Flutter Support

• Relaxed SDK constraints: Dart >=2.12.0 <4.0.0 (was >=3.0.0 <4.0.0)
• Relaxed Flutter constraints: Flutter >=2.5.0 (was >=3.24.0)
• Backward compatibility: Now supports older Flutter projects and legacy codebases
• Wider adoption: Compatible with Flutter 2.5+ to latest versions
• Enterprise friendly: Works with conservative enterprise Flutter versions

🎯 User Experience

• Clear installation instructions: Users get the correct version for dependencies
• Up-to-date feature list: Recent language accuracy improvements documented
• Better onboarding: New users see current capabilities and improvements
• Legacy project support: Existing projects can now use the package without upgrading
• Team flexibility: Different team members can use different Flutter versions

🔧 Code Quality & Formatting

📝 Dart Formatting Fixes

• Fixed code formatting: Resolved Dart format issues in 2 files
  • lib/src/languages/russian.dart - Gender agreement implementation formatting
  • test/number_to_words_vietnamese_additional_test.dart - Test case formatting
• Improved pub.dev score: Better compliance with Dart style guidelines
• CI/CD compatibility: All dart format --set-exit-if-changed . checks now pass
• Zero functional changes: No breaking changes, all 147 tests continue to pass

📊 Code Standards

• Consistent formatting: All files follow official Dart style guide
• Better readability: Improved code structure and indentation
• Maintenance ready: Easier for contributors to follow coding standards

🐛 Bug Fixes & Quality Improvements

🇻🇳 Vietnamese Language Corrections

• Fixed number reading rules:
  • 10 → "Mười" (capital M, proper pronunciation)
  • 15 → "mười lăm" (use "lăm" instead of "năm" after tens)
  • 20, 30, 40... → "hai mươi", "ba mươi", "bốn mươi" (use "mươi" for tens ≥ 20)
  • 21, 31, 41... → "hai mươi mốt" (use "mốt" instead of "một" after tens)
  • 24, 34, 44... → "hai mươi tư" (use "tư" instead of "bốn" after tens)
• Hundreds with zero tens: Use "lẻ" connector (105 → "một trăm lẻ năm")
• Currency formatting: Proper connector "và" (123.45 VND → "một trăm hai mươi ba đồng và bốn mươi lăm xu")
• Decimal reading: Use base digit names (123.45 → "... phẩy bốn năm")

🌍 International Language Fixes

• 🇷🇺 Russian: Fixed gender agreement for thousands
  • 1000 → "одна тысяча" (feminine form, was "один тысяча")
  • Proper gender forms for 1-2 with feminine nouns
• 🇸🇦 Arabic: Corrected number order and connectors
  • 21 → "واحد وعشرون" (ones before tens, was "عشرون واحد")
  • 123 → "مائة وثلاثة وعشرون" (proper "و" connectors)
  • Fixed word order according to Arabic grammar rules

📦 Pub.dev Score Improvements

• Optimized package description: Reduced from 201 to 127 characters (within 60-180 range)
• Fixed issue tracker URL: Verified GitHub issues URL accessibility
• Enhanced package metadata: Better compliance with Dart package conventions

🧪 Testing Enhancements

• Added Vietnamese-specific tests: Comprehensive coverage for new pronunciation rules
• Updated all Vietnamese test expectations: Aligned with corrected grammar
• Cross-language validation: Verified all 12 languages maintain accuracy

📊 Code Quality

• Zero breaking changes: All existing APIs remain fully compatible
• 147 test cases pass: Complete validation across all languages
• Improved documentation: Updated examples with correct Vietnamese forms
• Better pub.dev compliance: Enhanced package scoring potential

🚀 Architecture Refactoring & Extension Methods + 🥇 Ordinal Numbers + 💰 Currency Conversion

🏗️ Modular Architecture

• Separated language implementations: Each language now has its own dedicated file
  • lib/src/languages/english.dart - English implementation
  • lib/src/languages/vietnamese.dart - Vietnamese implementation
  • lib/src/languages/spanish.dart - Spanish implementation
• Abstract base class: NumberToWordsLanguage provides common interface for all languages
• Main API class: NumberToWords manages all language implementations
• Clean exports: Main library file exports all public APIs with proper documentation

✨ Extension Methods

• num.toWords(): Convert any number to English words directly
• Language-specific extensions:
  • num.toEnglish() - Convert to English
  • num.toVietnamese() - Convert to Vietnamese
  • num.toSpanish() - Convert to Spanish
  • num.toWordsInLanguage(String code) - Convert to any supported language
• Integer-specific extensions:
  • int.toCardinal() - Cardinal number conversion
  • int.canConvertToWords() - Validation method
  • int.wordLength() - Get character count of word representation
  • int.wordCount() - Get word count of representation
• Double-specific extensions:
  • double.toWordsWithDecimal() - Explicit decimal conversion
  • double.integerPartToWords() - Convert only integer part
  • double.decimalPartToWords() - Convert only decimal digits
• String extensions:
  • String.toWordsFromString() - Convert number strings to words
  • String.isValidNumberString() - Validate number strings
  • String.toWordsInMultipleLanguages() - Convert to multiple languages at once

🔧 Advanced Features

• Dynamic language registration: NumberToWords.registerLanguage()
• Language introspection: NumberToWords.getLanguageInfo()
• Direct language access: NumberToWords.getLanguage()
• Runtime language management: Register/unregister languages dynamically

🥇 NEW: Ordinal Numbers Support

• Full ordinal support: Convert numbers to ordinal form (1st, 2nd, 3rd, etc.) in all 12 languages
• New API method: NumberToWords.convertOrdinal(languageCode, number)
• Complete extension methods: toOrdinal(), toOrdinalVietnamese(), toOrdinalFrench(), etc.
• Smart English ordinals: Proper irregular forms (first, second, third, eleventh, twelfth, twenty-first)
• Integer-specific methods: toOrdinalWords(), getOrdinalSuffix(), canConvertToOrdinal()
• Global coverage: All 12 languages support ordinal conversion with culturally appropriate forms

💰 NEW: Currency Conversion Support

• 12 major currencies: USD, EUR, GBP, JPY, VND, CNY, KRW, THB, SGD, AUD, CAD, CHF
• New API method: NumberToWords.convertCurrency(languageCode, amount, currencyCode)
• Currency extension methods: toCurrency(), toUSD(), toEUR(), toVND(), toCNY(), etc.
• Multi-language currency names: Proper currency names in all 12 languages
• Subunit handling: Automatic cents, pence, xu, jiao, etc. for appropriate currencies
• No-decimal currencies: Special handling for JPY, KRW (no subunits)
• Smart plural forms: Proper singular/plural currency names (dollar vs dollars)
• Localized connectors: "and" (EN), "et" (FR), "y" (ES), "und" (DE), "و" (AR), etc.

📚 Enhanced Documentation

• Comprehensive API documentation: Every method has detailed docs with examples
• Library-level documentation: Clear usage guide in main library file
• Migration guide: Step-by-step guide for upgrading from legacy API
• Interactive example app: Showcases all new extension methods and APIs

🧪 Comprehensive Testing

• 145 test cases: Complete coverage of all features including ordinals and currency
• 15 new ordinal tests: Dedicated coverage for all ordinal functionality
• 15 new currency tests: Complete currency conversion testing across all languages
• Extension method tests: Dedicated test groups for each extension type
• Architecture tests: Validation of modular design
• Edge case handling: Robust error handling and validation

📱 Example App Enhancements

• Extension methods demo: Interactive showcase of all extension methods
• 🆕 Ordinal numbers demo: Real-time ordinal conversion in all 12 languages
• 🆕 Currency conversion demo: Interactive currency conversion with all supported currencies
• Real-time examples: Dynamic code examples that update with user input
• Multi-API comparison: Side-by-side comparison of different APIs
• Smart UI: Ordinals only shown for positive integers, currency shown for all numbers
• Better UI: Modern Material Design 3 interface

🔄 Backward Compatibility

• 100% compatible: All existing code continues to work unchanged

• Legacy API preserved: NumberToWordsEnglish class remains fully functional

• Smooth migration path: Clear examples showing old vs new API usage

• Zero breaking changes: Existing code requires no modifications

• Smooth migration: Old API redirects to new English implementation

🏗️ Architecture Improvements

• Abstract base class: NumberToWordsLanguage for extensible language support
• Modular design: Separate implementations for each language
• Performance optimized: Efficient number processing algorithms
• Well tested: 59 comprehensive test cases covering all languages

📚 Documentation & Examples

• Updated README: Comprehensive multi-language examples and API documentation
• Example app: Interactive demo showcasing all supported languages
• Migration guide: Clear instructions for upgrading from legacy API

🧪 Testing

• 59 test cases: Covering all languages, edge cases, and API compatibility
• Language-specific tests: Validation of number conversion rules for each language
• Backward compatibility tests: Ensures legacy API continues to function