Reader<R, A> class final

Reader<R, A> allows to read values A from a dependency/context R without explicitly passing the dependency between multiple nested function calls.

Inheritance

• Object
• HKT2<ReaderHKT, R, A>
• Reader

Mixed in types

• Functor2<ReaderHKT, R, A>
• Applicative2<ReaderHKT, R, A>
• Monad2<ReaderHKT, R, A>

Constructors

Reader(A _read(R r))

Build a Reader given A Function(R).

const

Reader.flatten(Reader<R, Reader<R, A>> reader)

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

factory

Properties

hashCode → int

The hash code for this object.

read-only, override

runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Methods

andThen<C>(covariant Reader<R, C> then()) → Reader<R, C>

Chain the result of then to this Reader.

override

ap<C>(covariant Reader<R, C Function(A a)> a) → Reader<R, C>

Apply the function contained inside a to change the value of type A to a value of type B.

override

ask() → Reader<R, R>

Read the current dependency R.

asks(A f(R r)) → Reader<R, A>

Change reading function to f given context/dependency R.

call<C>(covariant Reader<R, C> chain) → Reader<R, C>

Chain multiple functions having the reader R.

override

chainFirst<C>(covariant Reader<R, C> chain(A a)) → Reader<R, A>

Chain a request that returns another Reader, execute it, ignore the result, and return the same value as the current Reader.

override

compose<C>(Reader<R, C> reader) → Reader<R, C>

Compose the dependency R of this Reader to reader.

flatMap<C>(covariant Reader<R, C> f(A a)) → Reader<R, C>

Used to chain multiple functions that return a Reader.

override

local<R1>(R f(R1 context)) → Reader<R1, A>

Change dependency type of Reader<R, A> from R to R1 after calling run.

map<C>(C f(A a)) → Reader<R, C>

Change the value of type A to a value of type C using function f.

override

map2<C, D>(covariant Reader<R, C> m1, D f(A a, C c)) → Reader<R, D>

Change type of this Reader based on its value of type A and the value of type C of another Reader.

override

map3<C, D, E>(covariant Reader<R, C> m1, covariant Reader<R, D> m2, E f(A a, C c, D d)) → Reader<R, E>

Change type of this Reader based on its value of type A, the value of type C of a second Reader, and the value of type D of a third Reader.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

pure<C>(C c) → Reader<R, C>

Return a Reader containing the value c.

override

run(R r) → A

Provide the value R (dependency) and extract result A.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

override