ReaderTaskEither<E, L, R> class final

ReaderTaskEither<E, L, R> represents an asynchronous computation (Task) that either yields a value of type R or fails yielding an error of type L (Either), that allows to read values from a dependency/context E (Reader).

ReaderTaskEither models a complete program using Reader for dependency injection, Task to perform asynchronous computation, and Either to handle errors.

Inheritance

• Object
• HKT3<_ReaderTaskEitherHKT, E, L, R>
• ReaderTaskEither

Mixed-in types

• Functor3<_ReaderTaskEitherHKT, E, L, R>
• Applicative3<_ReaderTaskEitherHKT, E, L, R>
• Monad3<_ReaderTaskEitherHKT, E, L, R>
• Alt3<_ReaderTaskEitherHKT, E, L, R>

Constructors

ReaderTaskEither(Future<Either<L, R>> _run(E env))

Build a ReaderTaskEither from a function returning a Future<Either<L, R>>.

const

ReaderTaskEither.asks(R f(E))

Extract a value A given the current dependency E.

factory

ReaderTaskEither.Do(DoFunctionReaderTaskEither<E, L, R> f)

Initialize a Do Notation chain.

factory

ReaderTaskEither.flatten(ReaderTaskEither<E, L, ReaderTaskEither<E, L, R>> readerTaskEither)

Flat a ReaderTaskEither contained inside another ReaderTaskEither to be a single ReaderTaskEither.

factory

ReaderTaskEither.fromEither(Either<L, R> either)

Build a ReaderTaskEither that returns either.

factory

ReaderTaskEither.fromIO(IO<R> io)

Build a ReaderTaskEither that returns a Right containing the result of running io.

factory

ReaderTaskEither.fromIOEither(IOEither<L, R> io)

Build a ReaderTaskEither that returns a Right containing the result of running io.

factory

ReaderTaskEither.fromIOOption(IOOption<R> io, L onNone())

Build a ReaderTaskEither that returns a Right containing the result of running io, or the result of onNone if io is Left.

factory

ReaderTaskEither.fromNullable(R? r, L onNull())

If r is null, then return the result of onNull in Left. Otherwise return Right(r).

factory

ReaderTaskEither.fromNullableAsync(R? r, Task<L> onNull)

If r is null, then return the result of onNull in Left. Otherwise return Right(r).

factory

ReaderTaskEither.fromOption(Option<R> option, L onNone())

Build a ReaderTaskEither from option.

factory

ReaderTaskEither.fromReader(Reader<E, R> reader)

Build a ReaderTaskEither that returns a Right containing the result of running reader.

factory

ReaderTaskEither.fromTask(Task<R> task)

Build a ReaderTaskEither that returns a Right containing the result of running task.

factory

ReaderTaskEither.fromTaskEither(TaskEither<L, R> task)

Build a ReaderTaskEither that returns a Right containing the result of running task.

factory

ReaderTaskEither.fromTaskOption(TaskOption<R> task, L onNone())

Build a ReaderTaskEither that returns a Right containing the result of running task, or the result of onNone if task is Left.

factory

ReaderTaskEither.left(L left)

Build a ReaderTaskEither that returns a Left(left).

factory

ReaderTaskEither.leftReader(Reader<E, L> reader)

Build a ReaderTaskEither from a Reader<E, L>.

factory

ReaderTaskEither.leftTask(Task<L> task)

Build a ReaderTaskEither that returns a Left containing the result of running task.

factory

ReaderTaskEither.of(R r)

Build a ReaderTaskEither that returns a Right(r).

factory

ReaderTaskEither.tryCatch(Future<R> run(E), L onError(Object error, StackTrace stackTrace))

Execute an async function (Future) and convert the result to Either:

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

alt(covariant ReaderTaskEither<E, L, R> orElse()) → ReaderTaskEither<E, L, R>

When this ReaderTaskEither returns Right, then return the current ReaderTaskEither. Otherwise return the result of orElse.

override

andThen<C>(covariant ReaderTaskEither<E, L, C> then()) → ReaderTaskEither<E, L, C>

If running this ReaderTaskEither returns Right, then return the result of calling then. Otherwise return Left.

override

ap<C>(covariant ReaderTaskEither<E, L, C Function(R r)> a) → ReaderTaskEither<E, L, C>

Apply the function contained inside a to change the value on the Right from type R to a value of type C.

override

bimap<C, D>(C mLeft(L l), D mRight(R r)) → ReaderTaskEither<E, C, D>

Define two functions to change both the Left and Right value of the ReaderTaskEither.

call<C>(covariant ReaderTaskEither<E, L, C> chain) → ReaderTaskEither<E, L, C>

Chain multiple functions having the same left type L.

override

chainFirst<N1>(covariant ReaderTaskEither<E, L, N1> chain(R p1)) → ReaderTaskEither<E, L, R>

override

filterOrElse(bool f(R r), L onFalse(R r)) → ReaderTaskEither<E, L, R>

If f applied on this ReaderTaskEither as Right returns true, then return this ReaderTaskEither. If it returns false, return the result of onFalse in a Left.

flatMap<C>(covariant ReaderTaskEither<E, L, C> f(R r)) → ReaderTaskEither<E, L, C>

Used to chain multiple functions that return a ReaderTaskEither.

override

flatMapTaskEither<C>(TaskEither<L, C> f(R r)) → ReaderTaskEither<E, L, C>

Chain a function that takes the current value R inside this TaskEither and returns Either.

getOrElse(R orElse(L left)) → ReaderTask<E, R>

Convert this ReaderTaskEither to a ReaderTask.

map<C>(C f(R r)) → ReaderTaskEither<E, L, C>

If running this ReaderTaskEither returns Right, then change its value from type R to type C using function f.

override

map2<N1, N2>(covariant ReaderTaskEither<E, L, N1> m1, N2 f(R p1, N1 p2)) → ReaderTaskEither<E, L, N2>

override

map3<N1, N2, N3>(covariant ReaderTaskEither<E, L, N1> m1, covariant ReaderTaskEither<E, L, N2> m2, N3 f(R p1, N1 p2, N2 p3)) → ReaderTaskEither<E, L, N3>

override

mapLeft<C>(C f(L l)) → ReaderTaskEither<E, C, R>

Change the value in the Left of ReaderTaskEither.

match<B>(B onLeft(L left), B onRight(R right)) → ReaderTask<E, B>

Pattern matching to convert a ReaderTaskEither to a ReaderTask.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

orElse<TL>(ReaderTaskEither<E, TL, R> orElse(L l)) → ReaderTaskEither<E, TL, R>

When this ReaderTaskEither returns a Left then return the result of orElse. Otherwise return this ReaderTaskEither.

pure<C>(C a) → ReaderTaskEither<E, L, C>

Returns a ReaderTaskEither that returns a Right(a).

override

run(E env) → Future<Either<L, R>>

Run the task given E and return a Future<Either<L, R>>.

swap() → ReaderTaskEither<E, R, L>

Change this ReaderTaskEither from ReaderTaskEither<L, R> to ReaderTaskEither<R, L>.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

ask<E, L>() → ReaderTaskEither<E, L, E>

Read the current dependency E.