ReaderTask<E, A> class final

ReaderTask represents an asynchronous computation that yields a value of type A from a context of type E and never fails.

If you want to represent an asynchronous computation that may fail, see ReaderTaskEither.

Inheritance
Mixed in types

Constructors

ReaderTask(Future<A> _run(E env))
Build a ReaderTask from a function returning a Future given E.
const
ReaderTask.asks(A f(E))
Extract a value A given the current dependency E.
factory
ReaderTask.Do(DoFunctionReaderTask<E, A> f)
Initialize a Do Notation chain.
factory
ReaderTask.flatten(ReaderTask<E, ReaderTask<E, A>> task)
Flat a ReaderTask contained inside another ReaderTask to be a single ReaderTask.
factory
ReaderTask.of(A a)
Build a ReaderTask that returns a.
factory

Properties

hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

andThen<B>(covariant ReaderTask<E, B> then()) → ReaderTask<E, B>
Run this ReaderTask and right after the ReaderTask returned from then.
override
ap<B>(covariant ReaderTask<E, B Function(A a)> a) → ReaderTask<E, B>
Apply the function contained inside a to change the value of type A to a value of type B.
override
call<B>(covariant ReaderTask<E, B> chain) → ReaderTask<E, B>
Chain multiple ReaderTask functions.
override
chainFirst<B>(covariant ReaderTask<E, B> chain(A a)) → ReaderTask<E, A>
override
flatMap<B>(covariant ReaderTask<E, B> f(A a)) → ReaderTask<E, B>
Used to chain multiple functions that return a ReaderTask.
override
map<B>(B f(A a)) → ReaderTask<E, B>
Change the returning value of the ReaderTask from type A to type B using f.
override
map2<C, D>(covariant ReaderTask<E, C> mc, D f(A a, C c)) → ReaderTask<E, D>
Change type of this ReaderTask based on its value of type A and the value of type C of another ReaderTask.
override
map3<C, D, F>(covariant ReaderTask<E, C> mc, covariant ReaderTask<E, D> md, F f(A a, C c, D d)) → ReaderTask<E, F>
Change type of this ReaderTask based on its value of type A, the value of type C of a second ReaderTask, and the value of type D of a third ReaderTask.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
pure<B>(B a) → ReaderTask<E, B>
Return a ReaderTask returning the value b.
override
run(E env) → Future<A>
Run the task and return a Future.
toReaderTaskEither<L>() → ReaderTaskEither<E, L, A>
Convert this ReaderTask to ReaderTaskEither.
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Methods

ask<E, A>() → ReaderTask<E, E>
Read the current dependency E.