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Description:

sealed countries

This ISO-driven, fully tested and pure Dart package provides information about world countries in form of compile-time, tree-shakable 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(language: LangEng(), 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 135+ 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/constructors:

permissive - allows the creation of custom class instances that are not fully compatible with the ISO standard.
maybeFromAnyCode - returns a country instance if the value matches any ISO 3166 code, otherwise returns null.
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.
fromCodeNumeric - returns a country instance if the value matches the provided ISO 3166-1 numeric code.
maybeFromCode - returns a country instance if the value matches the provided ISO 3166-1 Alpha-3 code, otherwise returns null.
maybeFromCodeShort - returns a country instance if the value matches the provided ISO 3166-1 Alpha-2 code, otherwise returns null.
maybeFromCodeNumeric - returns a country instance if the value matches the provided ISO 3166-1 numeric code, otherwise returns null.

and (thanks to sealed nature of the class) functional-style like methods: whenOrNull, maybeWhen, when, map, maybeMap and is* boolean getters. You can also find a lot of common method you may know from Dart ecosystem - toString overrides, copyWith, toJson, etc. Also a compile time const, tree-shakable, case case insensitive code maps (for a 0(1) access time code mapping), list and much more.

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
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Then import the package in your Dart code:
import 'package:sealed_countries/sealed_countries.dart';
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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 country = WorldCountry.fromCode("MEX");
print(country.name.common); // Prints: "Mexico".
print(country.isMex); // Prints: true.

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.internationalName} translated to Slovak language: ${country.translation(BasicLocale(LangSlk())).name}""",
);
}
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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 (without losing it's sealed nature), you can also override existing or add new 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 (all GlobalMaterialLocalizations and GlobalCupertinoLocalizations locales and more).
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 100% code coverage, with more than 1021 (+2117 in underling packages) tests, providing confidence in its reliability and stability.
Industry adopted: This package is actively used in production by numerous European companies, ensuring its efficacy and robustness in real-world scenarios.
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
Primary Translations Source
Secondary Translations Source
Project Roadmap