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ReaderTask

Instances​

Combinators​

Constructors​

Conversions​

Do notation​

Instance methods​

Legacy​

Lifting​

Mapping​

Model​

Sequencing​

Traversing​

Type lambdas​

Utilities​

Instances​

ApplicativePar​

Runs computations in parallel.

Signature​

export declare const ApplicativePar: Applicative2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

ApplicativeSeq​

Runs computations sequentially.

Signature​

export declare const ApplicativeSeq: Applicative2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

ApplyPar​

Runs computations in parallel.

Signature​

export declare const ApplyPar: Apply2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

ApplySeq​

Runs computations sequentially.

Signature​

export declare const ApplySeq: Apply2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Chain​

Signature​

export declare const Chain: chainable.Chain2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

ChainRec​

ChainRec for ReaderTask

Signature​

export declare const ChainRec: ChainRec2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2022-present Jacob Alford

FromIO​

Signature​

export declare const FromIO: FromIO2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

FromReader​

Signature​

export declare const FromReader: FromReader2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

FromTask​

Signature​

export declare const FromTask: FromTask2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Functor​

Signature​

export declare const Functor: Functor2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Monad​

Signature​

export declare const Monad: Monad2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

MonadIO​

Signature​

export declare const MonadIO: MonadIO2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

MonadTask​

Signature​

export declare const MonadTask: MonadTask2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Pointed​

Signature​

export declare const Pointed: Pointed2<URI>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Combinators​

tap​

Composes computations in sequence, using the return value of one computation to determine the next computation and keeping only the result of the first.

Signature​

export declare const tap: {
  <R1, A, R2, _>(self: ReaderTask<R1, A>, f: (a: A) => ReaderTask<R2, _>): ReaderTask<R1 & R2, A>
  <A, R2, _>(f: (a: A) => ReaderTask<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R2 & R1, A>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

tapIO​

Composes computations in sequence, using the return value of one computation to determine the next computation and keeping only the result of the first.

Signature​

export declare const tapIO: {
  <A, _>(f: (a: A) => IO<_>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, A>
  <R, A, _>(self: ReaderTask<R, A>, f: (a: A) => IO<_>): ReaderTask<R, A>
}

Details​

  • Added in 0.1.0

Example​

import { pipe } from '@fp-tx/core/function'
import * as RT from '@fp-tx/core/ReaderTask'
import * as Console from '@fp-tx/core/Console'

// Will produce `Hello, fp-ts` to the stdout
const effect = pipe(
  RT.ask<string>(),
  RT.tapIO(value => Console.log(`Hello, ${value}`)),
)

async function test() {
  assert.deepStrictEqual(await effect('fp-ts')(), 'fp-ts')
}

test()

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

tapReader​

Composes computations in sequence, using the return value of one computation to determine the next computation and keeping only the result of the first.

Signature​

export declare const tapReader: {
  <R2, A, _>(f: (a: A) => R.Reader<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>
  <R1, R2, A, _>(self: ReaderTask<R1, A>, f: (a: A) => R.Reader<R2, _>): ReaderTask<R1 & R2, A>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

tapReaderIO​

Composes computations in sequence, using the return value of one computation to determine the next computation and keeping only the result of the first.

Signature​

export declare const tapReaderIO: {
  <R2, A, _>(f: (a: A) => ReaderIO<R2, _>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>
  <R1, R2, A, _>(self: ReaderTask<R1, A>, f: (a: A) => ReaderIO<R2, _>): ReaderTask<R1 & R2, A>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

tapTask​

Composes computations in sequence, using the return value of one computation to determine the next computation and keeping only the result of the first.

Signature​

export declare const tapTask: {
  <A, _>(f: (a: A) => Task<_>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, A>
  <R, A, _>(self: ReaderTask<R, A>, f: (a: A) => Task<_>): ReaderTask<R, A>
}

Details​

  • Added in 0.1.0

Example​

import { pipe } from '@fp-tx/core/function'
import * as RT from '@fp-tx/core/ReaderTask'
import * as T from '@fp-tx/core/Task'

const effect = pipe(
  RT.ask<number>(),
  RT.tapTask(value => T.of(value + 1)),
)

async function test() {
  assert.deepStrictEqual(await effect(1)(), 1)
}

test()

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Constructors​

ask​

Reads the current context.

Signature​

export declare const ask: <R>() => ReaderTask<R, R>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

asks​

Projects a value from the global context in a ReaderTask.

Signature​

export declare const asks: <R, A>(f: (r: R) => A) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

asksReaderTask​

Effectfully accesses the environment.

Signature​

export declare const asksReaderTask: <R, A>(f: (r: R) => ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

asksReaderTaskW​

Less strict version of asksReaderTask.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const asksReaderTaskW: <R1, R2, A>(f: (r1: R1) => ReaderTask<R2, A>) => ReaderTask<R1 & R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

of​

Signature​

export declare const of: <R = unknown, A = never>(a: A) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Conversions​

fromIO​

Signature​

export declare const fromIO: <A, R = unknown>(fa: IO<A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromReader​

Signature​

export declare const fromReader: <R, A>(fa: R.Reader<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromReaderIO​

Signature​

export declare const fromReaderIO: <R, A>(fa: ReaderIO<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromTask​

Signature​

export declare const fromTask: <A, R = unknown>(fa: Task<A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Do notation​

Do​

Signature​

export declare const Do: ReaderTask<unknown, {}>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

apS​

Signature​

export declare const apS: <N extends string, A, E, B>(
  name: Exclude<N, keyof A>,
  fb: ReaderTask<E, B>,
) => (fa: ReaderTask<E, A>) => ReaderTask<E, { readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

apSW​

Less strict version of apS.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const apSW: <A, N extends string, R2, B>(
  name: Exclude<N, keyof A>,
  fb: ReaderTask<R2, B>,
) => <R1>(fa: ReaderTask<R1, A>) => ReaderTask<
  R1 & R2,
  {
    readonly [K in keyof A | N]: K extends keyof A ? A[K] : B
  }
>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

bind​

Signature​

export declare const bind: <N extends string, A, E, B>(
  name: Exclude<N, keyof A>,
  f: (a: A) => ReaderTask<E, B>,
) => (ma: ReaderTask<E, A>) => ReaderTask<E, { readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

bindTo​

Signature​

export declare const bindTo: <N extends string>(
  name: N,
) => <E, A>(fa: ReaderTask<E, A>) => ReaderTask<E, { readonly [K in N]: A }>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

bindW​

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const bindW: <N extends string, A, R2, B>(
  name: Exclude<N, keyof A>,
  f: (a: A) => ReaderTask<R2, B>,
) => <R1>(fa: ReaderTask<R1, A>) => ReaderTask<
  R1 & R2,
  {
    readonly [K in keyof A | N]: K extends keyof A ? A[K] : B
  }
>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Instance methods​

chainRec​

Signature​

export declare const chainRec: ChainRec2<URI>['chainRec']

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2022-present Jacob Alford

Legacy​

chain​

Alias of flatMap.

Signature​

export declare const chain: <A, R, B>(f: (a: A) => ReaderTask<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirst​

Alias of tap.

Signature​

export declare const chainFirst: <A, R, B>(
  f: (a: A) => ReaderTask<R, B>,
) => (first: ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstIOK​

Alias of tapIO.

Signature​

export declare const chainFirstIOK: <A, B>(f: (a: A) => IO<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstReaderIOK​

Alias of tapReaderIO.

Signature​

export declare const chainFirstReaderIOK: <A, R, B>(
  f: (a: A) => ReaderIO<R, B>,
) => (ma: ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstReaderIOKW​

Alias of tapReaderIO.

Less strict version of chainFirstReaderIOK.

Signature​

export declare const chainFirstReaderIOKW: <A, R2, B>(
  f: (a: A) => ReaderIO<R2, B>,
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstReaderK​

Alias of tapReader.

Signature​

export declare const chainFirstReaderK: <A, R, B>(
  f: (a: A) => R.Reader<R, B>,
) => (ma: ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstReaderKW​

Alias of tapReader.

Less strict version of chainFirstReaderK.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const chainFirstReaderKW: <A, R1, B>(
  f: (a: A) => R.Reader<R1, B>,
) => <R2>(ma: ReaderTask<R2, A>) => ReaderTask<R1 & R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstTaskK​

Alias of tapTask.

Signature​

export declare const chainFirstTaskK: <A, B>(f: (a: A) => T.Task<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainFirstW​

Alias of tap.

Signature​

export declare const chainFirstW: <R2, A, B>(
  f: (a: A) => ReaderTask<R2, B>,
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainIOK​

Alias of flatMapIO.

Signature​

export declare const chainIOK: <A, B>(f: (a: A) => IO<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainReaderIOK​

Alias of flatMapReaderIO.

Signature​

export declare const chainReaderIOK: <A, R, B>(
  f: (a: A) => ReaderIO<R, B>,
) => (ma: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainReaderIOKW​

Alias of flatMapReaderIO.

Less strict version of chainReaderIOK.

Signature​

export declare const chainReaderIOKW: <A, R2, B>(
  f: (a: A) => ReaderIO<R2, B>,
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainReaderK​

Alias of flatMapReader.

Signature​

export declare const chainReaderK: <A, R, B>(f: (a: A) => R.Reader<R, B>) => (ma: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainReaderKW​

Alias of flatMapReader.

Less strict version of chainReaderK.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const chainReaderKW: <A, R1, B>(
  f: (a: A) => R.Reader<R1, B>,
) => <R2>(ma: ReaderTask<R2, A>) => ReaderTask<R1 & R2, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainTaskK​

Alias of flatMapTask.

Signature​

export declare const chainTaskK: <A, B>(f: (a: A) => T.Task<B>) => <R>(first: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

chainW​

Alias of flatMap.

Signature​

export declare const chainW: <R2, A, B>(
  f: (a: A) => ReaderTask<R2, B>,
) => <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Lifting​

fromIOK​

Signature​

export declare const fromIOK: <A extends ReadonlyArray<unknown>, B>(
  f: (...a: A) => IO<B>,
) => <R = unknown>(...a: A) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromReaderIOK​

Signature​

export declare const fromReaderIOK: <A extends readonly unknown[], R, B>(
  f: (...a: A) => ReaderIO<R, B>,
) => (...a: A) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromReaderK​

Signature​

export declare const fromReaderK: <A extends ReadonlyArray<unknown>, R, B>(
  f: (...a: A) => R.Reader<R, B>,
) => (...a: A) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

fromTaskK​

Signature​

export declare const fromTaskK: <A extends ReadonlyArray<unknown>, B>(
  f: (...a: A) => T.Task<B>,
) => <R = unknown>(...a: A) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Mapping​

as​

Maps the value to the specified constant value.

Signature​

export declare const as: {
  <A>(a: A): <R, _>(self: ReaderTask<R, _>) => ReaderTask<R, A>
  <R, _, A>(self: ReaderTask<R, _>, a: A): ReaderTask<R, A>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

asUnit​

Maps the value to the void constant value.

Signature​

export declare const asUnit: <R, _>(self: ReaderTask<R, _>) => ReaderTask<R, void>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flap​

Signature​

export declare const flap: <A>(a: A) => <E, B>(fab: ReaderTask<E, (a: A) => B>) => ReaderTask<E, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

map​

map can be used to turn functions (a: A) => B into functions (fa: F<A>) => F<B> whose argument and return types use the type constructor F to represent some computational context.

Signature​

export declare const map: <A, B>(f: (a: A) => B) => <R>(fa: ReaderTask<R, A>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Model​

ReaderTask​

Signature​

export interface ReaderTask<R, A> {
  (r: R): Task<A>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Sequencing​

flatMap​

Signature​

export declare const flatMap: {
  <A, R2, B>(f: (a: A) => ReaderTask<R2, B>): <R1>(ma: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>
  <R1, A, R2, B>(ma: ReaderTask<R1, A>, f: (a: A) => ReaderTask<R2, B>): ReaderTask<R1 & R2, B>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flatMapIO​

Signature​

export declare const flatMapIO: {
  <A, B>(f: (a: A) => IO<B>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, B>
  <R, A, B>(self: ReaderTask<R, A>, f: (a: A) => IO<B>): ReaderTask<R, B>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flatMapReader​

Signature​

export declare const flatMapReader: {
  <A, R2, B>(f: (a: A) => R.Reader<R2, B>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>
  <R1, A, R2, B>(self: ReaderTask<R1, A>, f: (a: A) => R.Reader<R2, B>): ReaderTask<R1 & R2, B>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flatMapReaderIO​

Signature​

export declare const flatMapReaderIO: {
  <A, R2, B>(f: (a: A) => ReaderIO<R2, B>): <R1>(self: ReaderTask<R1, A>) => ReaderTask<R1 & R2, B>
  <R1, A, R2, B>(self: ReaderTask<R1, A>, f: (a: A) => ReaderIO<R2, B>): ReaderTask<R1 & R2, B>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flatMapTask​

Signature​

export declare const flatMapTask: {
  <A, B>(f: (a: A) => Task<B>): <R>(self: ReaderTask<R, A>) => ReaderTask<R, B>
  <R, A, B>(self: ReaderTask<R, A>, f: (a: A) => Task<B>): ReaderTask<R, B>
}

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flatten​

Signature​

export declare const flatten: <R, A>(mma: ReaderTask<R, ReaderTask<R, A>>) => ReaderTask<R, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

flattenW​

Less strict version of flatten.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const flattenW: <R1, R2, A>(mma: ReaderTask<R1, ReaderTask<R2, A>>) => ReaderTask<R1 & R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Traversing​

sequenceArray​

Equivalent to ReadonlyArray#sequence(Applicative).

Signature​

export declare const sequenceArray: <R, A>(arr: ReadonlyArray<ReaderTask<R, A>>) => ReaderTask<R, ReadonlyArray<A>>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseArray​

Equivalent to ReadonlyArray#traverseWithIndex(Applicative).

Signature​

export declare const traverseArray: <R, A, B>(
  f: (a: A) => ReaderTask<R, B>,
) => (as: readonly A[]) => ReaderTask<R, readonly B[]>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseArrayWithIndex​

Equivalent to ReadonlyArray#traverseWithIndex(Applicative).

Signature​

export declare const traverseArrayWithIndex: <R, A, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseReadonlyArrayWithIndex​

Equivalent to ReadonlyArray#traverseWithIndex(Applicative).

Signature​

export declare const traverseReadonlyArrayWithIndex: <A, R, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: readonly A[]) => ReaderTask<R, readonly B[]>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseReadonlyArrayWithIndexSeq​

Equivalent to ReadonlyArray#traverseWithIndex(ApplicativeSeq).

Signature​

export declare const traverseReadonlyArrayWithIndexSeq: <R, A, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: readonly A[]) => ReaderTask<R, readonly B[]>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseReadonlyNonEmptyArrayWithIndex​

Equivalent to ReadonlyNonEmptyArray#traverseWithIndex(Applicative).

Signature​

export declare const traverseReadonlyNonEmptyArrayWithIndex: <A, R, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: ReadonlyNonEmptyArray<A>) => ReaderTask<R, ReadonlyNonEmptyArray<B>>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseReadonlyNonEmptyArrayWithIndexSeq​

Equivalent to ReadonlyNonEmptyArray#traverseWithIndex(ApplicativeSeq).

Signature​

export declare const traverseReadonlyNonEmptyArrayWithIndexSeq: <R, A, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: ReadonlyNonEmptyArray<A>) => ReaderTask<R, ReadonlyNonEmptyArray<B>>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseSeqArray​

Equivalent to ReadonlyArray#traverse(ApplicativeSeq).

Signature​

export declare const traverseSeqArray: <R, A, B>(
  f: (a: A) => ReaderTask<R, B>,
) => (as: readonly A[]) => ReaderTask<R, readonly B[]>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

traverseSeqArrayWithIndex​

Equivalent to ReadonlyArray#traverseWithIndex(ApplicativeSeq).

Signature​

export declare const traverseSeqArrayWithIndex: <R, A, B>(
  f: (index: number, a: A) => ReaderTask<R, B>,
) => (as: ReadonlyArray<A>) => ReaderTask<R, ReadonlyArray<B>>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Type lambdas​

URI​

Signature​

export type URI = typeof URI

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

URI​

Signature​

export declare const URI = 'ReaderTask'

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

Utilities​

ApT​

Signature​

export declare const ApT: ReaderTask<unknown, readonly []>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

ap​

Signature​

export declare const ap: <R, A>(fa: ReaderTask<R, A>) => <B>(fab: ReaderTask<R, (a: A) => B>) => ReaderTask<R, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

apFirst​

Combine two effectful actions, keeping only the result of the first.

Signature​

export declare const apFirst: <E, B>(second: ReaderTask<E, B>) => <A>(first: ReaderTask<E, A>) => ReaderTask<E, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

apSecond​

Combine two effectful actions, keeping only the result of the second.

Signature​

export declare const apSecond: <E, B>(second: ReaderTask<E, B>) => <A>(first: ReaderTask<E, A>) => ReaderTask<E, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

apW​

Less strict version of ap.

The W suffix (short for Widening) means that the environment types will be merged.

Signature​

export declare const apW: <R2, A>(
  fa: ReaderTask<R2, A>,
) => <R1, B>(fab: ReaderTask<R1, (a: A) => B>) => ReaderTask<R1 & R2, B>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

do​

Signature​

export declare const do_: <MA extends ReaderTaskIterable<any, any>, A>(
  yieldFunction: (unwrap: <R, A>(ma: ReaderTask<R, A>) => ReaderTaskIterable<R, A>) => Generator<MA, A>,
) => ReaderTask<_.UnionToIntersection<MA extends ReaderTaskIterable<infer R, any> ? R : never>, A>

getMonoid​

Use getApplicativeMonoid instead.

Signature​

export declare const getMonoid: <R, A>(M: Monoid<A>) => Monoid<ReaderTask<R, A>>

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

getSemigroup​

Use getApplySemigroup instead.

Signature​

export declare const getSemigroup: <R, A>(S: Semigroup<A>) => Semigroup<ReaderTask<R, A>>

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

let​

Signature​

export declare const let_: <N extends string, A, B>(
  name: Exclude<N, keyof A>,
  f: (a: A) => B,
) => <E>(fa: ReaderTask<E, A>) => ReaderTask<E, { readonly [K in N | keyof A]: K extends keyof A ? A[K] : B }>

local​

Changes the value of the local context during the execution of the action ma (similar to Contravariant's contramap).

Signature​

export declare const local: <R2, R1>(f: (r2: R2) => R1) => <A>(ma: ReaderTask<R1, A>) => ReaderTask<R2, A>

Details​

  • Added in 0.1.0

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

readerTask​

This instance is deprecated, use small, specific instances instead. For example if a function needs a Functor instance, pass RT.Functor instead of RT.readerTask (where RT is from import RT from 'fp-ts/ReaderTask')

Signature​

export declare const readerTask: MonadTask2<URI>

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

readerTaskSeq​

This instance is deprecated, use small, specific instances instead. For example if a function needs a Functor instance, pass RT.Functor instead of RT.readerTaskSeq (where RT is from import RT from 'fp-ts/ReaderTask')

Signature​

export declare const readerTaskSeq: typeof readerTask

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

run​

Signature​

export declare function run<R, A>(ma: ReaderTask<R, A>, r: R): Promise<A>

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti

sequenceSeqArray​

Use traverseReadonlyArrayWithIndexSeq instead.

Signature​

export declare const sequenceSeqArray: <R, A>(arr: ReadonlyArray<ReaderTask<R, A>>) => ReaderTask<R, ReadonlyArray<A>>

Details​

  • Added in 0.1.0
  • Deprecated

License​

  • MIT – Copyright (c) 2017-present Giulio Canti