df_type 0.10.3

A package designed to simplify and enhance interactions with Dart types.

Dart & Flutter Packages by dev-cetera.com & contributors.

---

Summary

This package is designed to simplify and enhance interactions with Dart types. It provides tools for converting between types, checking type properties, and managing synchronous and asynchronous operations.

For a full feature set, please refer to the API reference.

Quickstart

enum Alphabet { A, B, C }

void main() async {
  print('Convert a String to an enum:\n');
  print(Alphabet.values.valueOf('A') == Alphabet.A); // true
  print(Alphabet.values.valueOf('a') == Alphabet.A); // true
  print(Alphabet.values.valueOf('b')); // Alphabet.B
  print(Alphabet.values.valueOf('qwerty') == null); // true

  print('\n*** Check if a type is nullable:\n');
  print(isNullable<String>()); // false
  print(isNullable<String?>()); // true
  print(isNullable<Null>()); // true

  print('\n*** Check if a type a subtype of another::\n');
  print(isSubtype<int, num>()); // true
  print(isSubtype<num, int>()); // false
  print(isSubtype<Future<int>, Future<dynamic>>()); // true
  print(isSubtype<Future<dynamic>, Future<int>>()); // false
  print(isSubtype<int Function(int), Function>()); // true
  print(isSubtype<Function, int Function(int)>()); // false

  print('\n*** Check if a type can be compared by value:\n');
  print(isEquatable<double>()); // true
  print(isEquatable<Null>()); // true
  print(isEquatable<Map<dynamic, dynamic>>()); // false
  print(isEquatable<Equatable>()); // true

  print('\n*** Only let a value be of a certain type, or return null:\n');
  print(letAsOrNull<String>(DateTime.now())); // null
  print(letAsOrNull<DateTime>(DateTime.now())); // returns the value
  print(letAsOrNull<DateTime?>(DateTime.now())); // returns the value
  print(letAsOrNull<DateTime?>(null)); // null

  print('\n*** Lazy-convert types to an int or return null:\n');
  final int? i = letIntOrNull('55');
  print(i); // 55

  print('\n*** Lazy-convert maps from one type to another or return null:\n');
  final Map<String, int>? m = letMapOrNull<String, int>({55: '56'});
  print(m); // {55, 56}

  print('\n*** Lazy-convert lists or return null:\n');
  print(letListOrNull<int>('1, 2, 3, 4')); // [1, 2, 3, 4]
  print(letListOrNull<int>('[1, 2, 3, 4]')); // [1, 2, 3, 4]
  print(letListOrNull<int>([1, 2, 3, 4])); // [1, 2, 3, 4]
  print(letListOrNull<int>(1)); // [1]

  print('\n*** Lazy-convert to double or return null:\n');
  print(letOrNull<double>('123')); // 123.0

  print('\n*** Convert a String to a Duration:\n');
  final Duration duration = const ConvertStringToDuration('11:11:00.00').toDuration();
  print(duration); // 11:11:00.000000

  print('\n*** Use thenOr with FutureOr:\n');
  print(1.thenOr((prev) => prev + 1)); // 2
  FutureOr<double> pi = 3.14159;
  final doublePi = pi.thenOr((prev) => prev * 2);
  print(doublePi); // 6.2832
  FutureOr<double> e = Future.value(2.71828);
  final doubleE = e.thenOr((prev) => prev * 2);
  print(doubleE); // Instance of 'Future<double>'
  print(await doubleE); // 5.43656
}

copied to clipboard

---

Contributing and Discussions

This is an open-source project, and we warmly welcome contributions from everyone, regardless of experience level. Whether you're a seasoned developer or just starting out, contributing to this project is a fantastic way to learn, share your knowledge, and make a meaningful impact on the community.

Ways you can contribute

• Buy me a coffee: If you'd like to support the project financially, consider buying me a coffee. Your support helps cover the costs of development and keeps the project growing.
• Find us on Discord: Feel free to ask questions and engage with the community here: https://discord.gg/gEQ8y2nfyX.
• Share your ideas: Every perspective matters, and your ideas can spark innovation.
• Help others: Engage with other users by offering advice, solutions, or troubleshooting assistance.
• Report bugs: Help us identify and fix issues to make the project more robust.
• Suggest improvements or new features: Your ideas can help shape the future of the project.
• Help clarify documentation: Good documentation is key to accessibility. You can make it easier for others to get started by improving or expanding our documentation.
• Write articles: Share your knowledge by writing tutorials, guides, or blog posts about your experiences with the project. It's a great way to contribute and help others learn.

No matter how you choose to contribute, your involvement is greatly appreciated and valued!

We drink a lot of coffee...

If you're enjoying this package and find it valuable, consider showing your appreciation with a small donation. Every bit helps in supporting future development. You can donate here: https://www.buymeacoffee.com/dev_cetera

License

This project is released under the MIT License. See LICENSE for more information.