• Minimum environment dart sdk to 3.0.0 ⚠️ (Dart 3️⃣)

environment:
  sdk: ">=3.0.0 <4.0.0"

• Added new ReaderTaskEither type
  • ReaderTaskEither models a complete program using Reader for dependency injection, Task to perform asynchronous computation, and Either to handle errors 🎯
• Added new ReaderTask type
• Either as sealed class (Dart 3️⃣)
  • You can now use exhaustive pattern matching (Left or Right)

/// Pattern matching
final match = right.match(
  (l) => print('Left($l)'),
  (r) => print('Right($r)'),
);

/// or use Dart's pattern matching as well 🤝
final dartMatch = switch (right) {
  Left(value: final l) => 'Left($l)',
  Right(value: final r) => 'Right($r)',
};

• Option as sealed class (Dart 3️⃣)
  • You can now use exhaustive pattern matching (None or Some)

/// Pattern matching
final match = option.match(
  () => print('None'),
  (a) => print('Some($a)'),
);

/// or use Dart's pattern matching as well 🤝
final dartMatch = switch (option) {
  None() => 'None',
  Some(value: final a) => 'Some($a)',
};

• Types marked as final (no extends nor implements) (Dart 3️⃣)
  • Unit
  • Reader
  • State
  • StateAsync
  • IO
  • IORef
  • IOOption
  • IOEither
  • Task
  • TaskOption
  • TaskEither
  • ReaderTask
  • ReaderTaskEither
• Removed Tuple2, use Dart 3 Records instead (Tuple2(a, b) becomes simply (a, b) 🎯) ⚠️ (Dart 3️⃣)
  • Updated all internal APIs to use records instead of Tuple2
• Major refactoring of Iterable and List extension methods
  • Improved performance
  • Correct return types (Iterable and List) (#65)
  • Added the following methods
    • prependAll (Iterable)
    • intersperse (Iterable)
    • difference (Iterable)
    • filterWithIndex (Iterable)
  • Fixed the following methods ⚠️
    • takeWhileRight: Resulting List now in reversed order as expected
    • dropWhileRight: Resulting List now in reversed order as expected
  • Updated the following methods ⚠️
    • foldRight, foldRightWithIndex (List): Changed parameter order in combine function
    • zipWith (Iterable): Changed parameters definition, no more curried
  • Renamed the following methods ⚠️
    • plus → concat (Iterable)
    • → (on )

/// As extension on [String]
final result = "10".toNumOption; /// `Some(10)`
final result = "10.5".toNumOption; /// `Some(10.5)`
final result = "0xFF".toIntOption; /// `Some(255)`
final result = "10.5".toDoubleOption; /// `Some(10.5)`
final result = "NO".toBoolEither(() => "left"); /// `Left("left")`

/// As functions
final result = toNumOption("10"); /// `Some(10)`
final result = toNumOption("10.5"); /// `Some(10.5)`
final result = toIntOption("0xFF"); /// `Some(255)`
final result = toDoubleOption("10.5"); /// `Some(10.5)`
final result = toBoolEither("NO", () => "left"); /// `Left("left")`

• Changed dateNow, now, random, and randomBool to getter functions

/// Before
Option<T> getRandomOption<T>(T value) => randomBool()
    .map((isValid) => isValid ? some(value) : none<T>())
    .run();

/// Now
Option<T> getRandomOption<T>(T value) => randomBool
    .map((isValid) => isValid ? some(value) : none<T>())
    .run();

• 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);

• Updated curry / uncarry extensions ⚠️
  • Renamed curry to curryAll for functions with 3, 4, 5 parameters
  • Changed definition of curry to curry only the first parameter
  • Changed uncurry and curry extension to getter function
  • Removed curry and uncurry as functions (use extension method instead)
  • Added curryLast (curry last parameter)

int Function(int) subtractCurried(int n1) => (n2) => n1 - n2;

/// Before
subtractCurried.uncurry()(10, 5);

final addFunction = (int a, int b) => a + b;
final add = curry2(addFunction);

[1, 2, 3].map(add(1));  // returns [2, 3, 4]

/// New
subtractCurried.uncurry(10, 5);

final addFunction = (int a, int b) => a + b;
final add = addFunction.curry;

[1, 2, 3].map(add(1)); // returns [2, 3, 4]
[1, 2, 3].map(addFunction.curry(1)); // returns [2, 3, 4]

• Changed Eq static constructors to methods
  • or
  • and
• Added xor method to Eq
• Moved DateTime instances of Eq as Eq static members

/// Before
final eq = dateEqYear; // Global

/// Now
final eq = Eq.dateEqYear;

• Added Eq instances for num, int, double, String, and bool

[1, 2, 3].difference(Eq.eqInt, [2, 3, 4]); /// `[1]`

• Added new method to Eq
  • contramap

class Parent {
  final int value1;
  final double value2;
  const Parent(this.value1, this.value2);
}

/// Equality for values of type [Parent] based on their `value1` ([int]).
final eqParentInt = Eq.eqInt.contramap<Parent>(
  (p) => p.value1,
);

/// Equality for of type [Parent] based on their `value2` ([double]).
final eqParentDouble = Eq.eqDouble.contramap<Parent>(
  (p) => p.value2,
);

• Changed reverse in Order from static constructor to getter method

/// Before
final reversed = Order.reverse(instance);

/// Now
final reversed = instance.reverse;

• Moved DateTime instances of Order as Order static members
• Added Order instances for num, int, double
• Added new methods to Order
  • between
  • clamp
  • contramap

class Parent {
  final int value1;
  final double value2;
  const Parent(this.value1, this.value2);
}

/// Order values of type [Parent] based on their `value1` ([int]).
final orderParentInt = Order.orderInt.contramap<Parent>(
  (p) => p.value1,
);

/// Order values of type [Parent] based on their `value2` ([double]).
final orderParentDouble = Order.orderDouble.contramap<Parent>(
  (p) => p.value2,
);

• Removed bool extension (match and fold), use the ternary operator or pattern matching instead ⚠️

final boolValue = Random().nextBool();

/// Before
final result = boolValue.match<int>(() => -1, () => 1);
final result = boolValue.fold<int>(() => -1, () => 1);

/// Now
final result = boolValue ? 1 : -1;
final result = switch (boolValue) { true => 1, false => -1 };

• Removed global id and idFuture, use identity and identityFuture instead ⚠️
• Removed global idFirst and idSecond functions ⚠️
• Removed Compose class and extension methods ⚠️
• Removed Magma typedef ⚠️
• Removed extension methods on nullable types (toOption, toEither, toTaskOption, toIOEither, toTaskEither, toTaskEitherAsync) ⚠️
• Organized all extensions inside internal extension folder
• Updated README
  • Getting started with fpdart complete guide
  • Full history of fpdart and functional programming in dart