sealed_countries 0.9.0

Provides data for world countries in the form of sealed classes.

This ISO-driven, fully tested and pure Dart package provides information about world countries in form of compile-time constant sealed classes. Contains the all 249+1 countries with ISO 3166 codes, their English, native names, emoji flags, capitals, population, postal codes, phone codes, languages (and scripts), currencies, country/currency/language name translations, etc. For Flutter ready widgets, please use world_countries package.

Features

WorldCountry class provides the following information about countries:

Field	Required	Description	Example for CountryIrl
name	Yes	The English name of the country.	CountryName.international(common: "Ireland", official: "Republic of Ireland")
namesNative	Yes	The native names of the country.	[CountryName(language: LangEng(), official: "Republic of Ireland", common: "Ireland"), CountryName(language: LangGle(), official: "Poblacht na hÉireann", common: "Éire")]
tld	Yes	The top level domain names for the country.	[".ie"]
code	Yes	The three-letter ISO 3166-1 Alpha-3 code of the country.	"IRL"
codeNumeric	Yes	The three-digit ISO 3166-1 Numeric code of the country.	"372"
codeShort	Yes	The two-letter ISO 3166-1 Alpha-2 code of the country.	"IE"
cioc	No	The International Olympic Committee code of the country.	"IRL"
independent	Yes	Whether the country is an independent state.	true
unMember	Yes	Whether the country is a member of the United Nations.	true
currencies	Yes	The currencies used in the country.	[FiatEur()]
idd	Yes	The international direct dialing codes for the country.	Idd(root: 3, suffixes: [53])
altSpellings	Yes	The alternate spellings of the country name.	["IE", "Éire", "Republic of Ireland", "Poblacht na hÉireann"]
continent	Yes	The continent where the country is located.	Europe()
subregion	No	The subregion where the country is located.	NorthernEurope()
languages	Yes	The official languages spoken in the country.	[LangEng(), LangGle()]
latLng	Yes	The geographic coordinates of the country.	LatLng(53, -8)
landlocked	Yes	Whether the country is landlocked.	false
bordersCodes	No	The codes of the countries that share borders with this country.	["GBR"]
areaMetric	Yes	The area of the country in square kilometers.	70273
demonyms	Yes	The demonym names for the people of the country.	[Demonyms(language: LangEng(), female: "Irish", male: "Irish"), Demonyms(language: LangFra(), female: "Irlandaise", male: "Irlandais")]
emoji	Yes	The emoji flag for the country.	🇮🇪
maps	Yes	The maps of the country.	Maps(googleMaps: "hxd1BKxgpchStzQC6", openStreetMaps: "relation/62273")
population	Yes	The population of the country.	4994724
gini	No	The Gini coefficient of the country.	Gini(year: 2017, coefficient: 31.4)
fifa	No	The FIFA code of the country.	"IRL"
car	Yes	The car information of the country.	Car(sign: "IRL", isRightSide: false)
timezones	Yes	The time zones of the country.	["UTC+00:00"]
capitalInfo	No	The capital city information of the country.	CapitalInfo(capital: Capital("Dublin"), latLng: LatLng(53.32, -6.23))
hasCoatOfArms	Yes	Whether the country has an official coat of arms.	true
postalCode	Yes	The postal code information of the country.	PostalCode with format and regExp
startOfWeek	Yes	The first day of the week in the country.	Weekday.monday
regionalBlocs	No	The regional blocs of the country.	[BlocEU()]
translations	Yes	The translations of the country name.	List of 150 TranslatedNames in different languages

Compile time constant list of all countries accessible via WorldCountry.list and more over, the WorldCountry class provides the following methods:

• maybeFromAnyCode - returns a country instance if the value matches any ISO 3166 code, otherwise returns null.
• fromCodeNumeric - returns a country instance if the value matches the provided ISO 3166-1 numeric code.
• fromAnyCode - returns a country instance if the value matches any ISO 4217 code.
• maybeFromValue - returns a country instance if the value matches the provided value, otherwise returns null.
• fromCode - returns a country instance if the value matches the provided ISO 3166-1 Alpha-3 code.
• fromCodeShort - returns a country instance if the value matches the provided ISO 3166-1 Alpha-2 code.

and (thanks to sealed nature of the class) functional-style like methods: whenOrNull, maybeWhen, when, map, maybeMap. You can also find a lot of common method you may know from Dart ecosystem - toString overrides, copyWith, toJson, etc.

Translations: Use maybeTranslation() or translation() methods to get translations for specific locale.

Getting started

To use this package, add sealed_countries as a dependency in your pubspec.yaml file.

dependencies:
  sealed_countries: any

Then import the package in your Dart code:

import 'package:sealed_countries/sealed_countries.dart';

Usage

Use WorldCountry class to get information about countries. Either construct a new instance directly or with use of the class factory constructors/static methods, or select one from the WorldCountry.list constant.

  print(WorldCountry.list.length); // Prints: "250".

  final mexico = WorldCountry.fromCode("MEX");
  print(mexico.name.common); // Prints: "Mexico".

  final europeanCountries = WorldCountry.list.where(
    (country) => country.continent is Europe,
  );
  print(europeanCountries); // Prints a list of European countries.

  for (final country in WorldCountry.list) {
  print(
    """${country.name.common} translated to Slovak language: ${country.translation(const LangSlk()).name}""",
  );
}

For more usage examples, please see the /example folder.

FAQ

Why should I use this package over any other country-related package?

• Sealed classes: This package provides data in the form of sealed classes, allowing you to create your own instances and work with them as with existing ones (for example this is not possible with enums or regular classes, you can also override existing data, etc.).
• No 3rd-party dependencies: This package has no third-party dependencies, ensuring that you won't have any issues or conflicts with other dependencies (no even meta here, because of that).
• Rich data: This package offers far more data than any other package + tons of translations.
• Type-safe: The contracts and types in this package are very strong, ensuring that your code is strongly typed and well-defined.
• High code coverage: The code in this package has a high level of coverage, providing confidence in its reliability and stability.
• MIT License: This package and sources are released under the MIT license, which is a permissive license that allows users to use, modify, and distribute the code with minimal restrictions. The MIT license is considered better than most other open-source licenses because it provides flexibility and allows users to incorporate the code into their projects without worrying about legal implications.

Additional information

If you like this package, please give it a star or like. For more information on using this package, check out the API documentation. PRs or ideas are always welcome. If you have any issues or suggestions for the package, please file them in the GitHub repository.

References, credits and sources

• ISO
• Wikipedia
• Data Source¹
• Translations Source
• Project Roadmap