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SandroMaglione / fpdart

Functional programming in Dart and Flutter. All the main functional programming types and patterns fully documented, tested, and with examples.
https://pub.dev/packages/fpdart
MIT License
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Predicate as extension methods #116

Closed SandroMaglione closed 1 year ago

SandroMaglione commented 1 year ago

Removed Predicate class and added extension methods in its place:

bool isEven(int n) => n % 2 == 0;
bool isDivisibleBy3(int n) => n % 3 == 0;

final isOdd = isEven.negate;
final isEvenAndDivisibleBy3 = isEven.and(isDivisibleBy3);
final isEvenOrDivisibleBy3 = isEven.or(isDivisibleBy3);
final isStringWithEvenLength = isEven.contramap<String>((n) => n.length);