reader

package
v1.0.108 Latest Latest
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 Go to latest Published: Feb 1, 2024 License: Apache-2.0 Imports: 4 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Ap 

func Ap[B, R, A any](fa Reader[R, A]) func(Reader[R, func(A) B]) Reader[R, B]

Ap applies a function to an argument under a type constructor.

func ApS added in v1.0.107 

func ApS[R, S1, S2, T any](
	setter func(T) func(S1) S2,
	fa Reader[R, T],
) func(Reader[R, S1]) Reader[R, S2]

ApS attaches a value to a context [S1] to produce a context [S2] by considering the context and the value concurrently

func ApplicativeMonoid 

func ApplicativeMonoid[R, A any](
	_of func(A) func(R) A,
	_map func(func(R) A, func(A) func(A) A) func(R, func(A) A),
	_ap func(func(R, func(A) A), func(R) A) func(R) A,

	m M.Monoid[A],
) M.Monoid[func(R) A]

func ApplySemigroup 

func ApplySemigroup[R, A any](
	_map func(func(R) A, func(A) func(A) A) func(R, func(A) A),
	_ap func(func(R, func(A) A), func(R) A) func(R) A,

	s S.Semigroup[A],
) S.Semigroup[func(R) A]

func Bind added in v1.0.107 

func Bind[R, S1, S2, T any](
	setter func(T) func(S1) S2,
	f func(S1) Reader[R, T],
) func(Reader[R, S1]) Reader[R, S2]

Bind attaches the result of a computation to a context [S1] to produce a context [S2]

func BindTo added in v1.0.107 

func BindTo[R, S1, T any](
	setter func(T) S1,
) func(Reader[R, T]) Reader[R, S1]

BindTo initializes a new state [S1] from a value [T]

func Chain 

func Chain[R, A, B any](f func(A) Reader[R, B]) func(Reader[R, A]) Reader[R, B]

Chain composes computations in sequence, using the return value of one computation to determine the next computation.

func Compose 

func Compose[R, B, C any](ab Reader[R, B]) func(Reader[B, C]) Reader[R, C]

func Curry1 

func Curry1[R, T1, A any](f func(R, T1) A) func(T1) Reader[R, A]

func Curry2 

func Curry2[R, T1, T2, A any](f func(R, T1, T2) A) func(T1) func(T2) Reader[R, A]

func Curry3 

func Curry3[R, T1, T2, T3, A any](f func(R, T1, T2, T3) A) func(T1) func(T2) func(T3) Reader[R, A]

func Curry4 

func Curry4[R, T1, T2, T3, T4, A any](f func(R, T1, T2, T3, T4) A) func(T1) func(T2) func(T3) func(T4) Reader[R, A]

func Flap added in v1.0.47 

func Flap[R, A, B any](a A) func(Reader[R, func(A) B]) Reader[R, B]

func From0 

func From0[F ~func(C) R, C, R any](f F) func() Reader[C, R]

From0 converts a function with 1 parameters returning a [R] into a function with 0 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From1 

func From1[F ~func(C, T0) R, T0, C, R any](f F) func(T0) Reader[C, R]

From1 converts a function with 2 parameters returning a [R] into a function with 1 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From10 

func From10[F ~func(C, T0, T1, T2, T3, T4, T5, T6, T7, T8, T9) R, T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, C, R any](f F) func(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9) Reader[C, R]

From10 converts a function with 11 parameters returning a [R] into a function with 10 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From2 

func From2[F ~func(C, T0, T1) R, T0, T1, C, R any](f F) func(T0, T1) Reader[C, R]

From2 converts a function with 3 parameters returning a [R] into a function with 2 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From3 

func From3[F ~func(C, T0, T1, T2) R, T0, T1, T2, C, R any](f F) func(T0, T1, T2) Reader[C, R]

From3 converts a function with 4 parameters returning a [R] into a function with 3 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From4 

func From4[F ~func(C, T0, T1, T2, T3) R, T0, T1, T2, T3, C, R any](f F) func(T0, T1, T2, T3) Reader[C, R]

From4 converts a function with 5 parameters returning a [R] into a function with 4 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From5 

func From5[F ~func(C, T0, T1, T2, T3, T4) R, T0, T1, T2, T3, T4, C, R any](f F) func(T0, T1, T2, T3, T4) Reader[C, R]

From5 converts a function with 6 parameters returning a [R] into a function with 5 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From6 

func From6[F ~func(C, T0, T1, T2, T3, T4, T5) R, T0, T1, T2, T3, T4, T5, C, R any](f F) func(T0, T1, T2, T3, T4, T5) Reader[C, R]

From6 converts a function with 7 parameters returning a [R] into a function with 6 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From7 

func From7[F ~func(C, T0, T1, T2, T3, T4, T5, T6) R, T0, T1, T2, T3, T4, T5, T6, C, R any](f F) func(T0, T1, T2, T3, T4, T5, T6) Reader[C, R]

From7 converts a function with 8 parameters returning a [R] into a function with 7 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From8 

func From8[F ~func(C, T0, T1, T2, T3, T4, T5, T6, T7) R, T0, T1, T2, T3, T4, T5, T6, T7, C, R any](f F) func(T0, T1, T2, T3, T4, T5, T6, T7) Reader[C, R]

From8 converts a function with 9 parameters returning a [R] into a function with 8 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func From9 

func From9[F ~func(C, T0, T1, T2, T3, T4, T5, T6, T7, T8) R, T0, T1, T2, T3, T4, T5, T6, T7, T8, C, R any](f F) func(T0, T1, T2, T3, T4, T5, T6, T7, T8) Reader[C, R]

From9 converts a function with 10 parameters returning a [R] into a function with 9 parameters returning a [Reader[C, R]] The first parameter is considered to be the context [C] of the reader

func Let added in v1.0.107 

func Let[R, S1, S2, T any](
	setter func(T) func(S1) S2,
	f func(S1) T,
) func(Reader[R, S1]) Reader[R, S2]

Let attaches the result of a computation to a context [S1] to produce a context [S2]

func LetTo added in v1.0.107 

func LetTo[R, S1, S2, T any](
	setter func(T) func(S1) S2,
	b T,
) func(Reader[R, S1]) Reader[R, S2]

LetTo attaches the a value to a context [S1] to produce a context [S2]

func Local 

func Local[R2, R1, A any](f func(R2) R1) func(Reader[R1, A]) Reader[R2, A]

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

func Map 

func Map[E, A, B any](f func(A) B) func(Reader[E, A]) Reader[E, B]

Map can be used to turn functions `func(A)B` into functions `(fa F[A])F[B]` whose argument and return types use the type constructor `F` to represent some computational context.

func Promap 

func Promap[E, A, D, B any](f func(D) E, g func(A) B) func(Reader[E, A]) Reader[D, B]

func Read 

func Read[E, A any](e E) func(Reader[E, A]) A

Read applies a context to a reader to obtain its value

func TraverseArray 

func TraverseArray[R, A, B any](f func(A) Reader[R, B]) func([]A) Reader[R, []B]

TraverseArray transforms an array

func TraverseArrayWithIndex added in v1.0.29 

func TraverseArrayWithIndex[R, A, B any](f func(int, A) Reader[R, B]) func([]A) Reader[R, []B]

TraverseArrayWithIndex transforms an array

func Uncurry0 

func Uncurry0[R, A any](f Reader[R, A]) func(R) A

func Uncurry1 

func Uncurry1[R, T1, A any](f func(T1) Reader[R, A]) func(R, T1) A

func Uncurry2 

func Uncurry2[R, T1, T2, A any](f func(T1) func(T2) Reader[R, A]) func(R, T1, T2) A

func Uncurry3 

func Uncurry3[R, T1, T2, T3, A any](f func(T1) func(T2) func(T3) Reader[R, A]) func(R, T1, T2, T3) A

func Uncurry4 

func Uncurry4[R, T1, T2, T3, T4, A any](f func(T1) func(T2) func(T3) func(T4) Reader[R, A]) func(R, T1, T2, T3, T4) A

Types

type Reader 

type Reader[R, A any] func(R) A

The purpose of the `Reader` monad is to avoid threading arguments through multiple functions in order to only get them where they are needed. The first template argument `R` is the the context to read from, the second argument `A` is the return value of the monad

func Ask 

func Ask[R any]() Reader[R, R]

Ask reads the current context

func Asks 

func Asks[R, A any](f Reader[R, A]) Reader[R, A]

Asks projects a value from the global context in a Reader

func AsksReader 

func AsksReader[R, A any](f func(R) Reader[R, A]) Reader[R, A]

func Curry0 

func Curry0[R, A any](f func(R) A) Reader[R, A]

func Do added in v1.0.107 

func Do[R, S any](
	empty S,
) Reader[R, S]

Bind creates an empty context of type [S] to be used with the Bind operation

func First 

func First[A, B, C any](pab Reader[A, B]) Reader[T.Tuple2[A, C], T.Tuple2[B, C]]

func Flatten 

func Flatten[R, A any](mma func(R) Reader[R, A]) Reader[R, A]

func MakeReader 

func MakeReader[R, A any](r Reader[R, A]) Reader[R, A]

MakeReader creates a reader, i.e. a method that accepts a context and that returns a value

func MonadAp 

func MonadAp[B, R, A any](fab Reader[R, func(A) B], fa Reader[R, A]) Reader[R, B]

func MonadChain 

func MonadChain[R, A, B any](ma Reader[R, A], f func(A) Reader[R, B]) Reader[R, B]

func MonadFlap added in v1.0.47 

func MonadFlap[R, A, B any](fab Reader[R, func(A) B], a A) Reader[R, B]

func MonadMap 

func MonadMap[E, A, B any](fa Reader[E, A], f func(A) B) Reader[E, B]

func Of 

func Of[R, A any](a A) Reader[R, A]

func Second 

func Second[A, B, C any](pbc Reader[B, C]) Reader[T.Tuple2[A, B], T.Tuple2[A, C]]

func SequenceArray 

func SequenceArray[R, A any](ma []Reader[R, A]) Reader[R, []A]

SequenceArray converts a homogeneous sequence of either into an either of sequence

func SequenceT1 

func SequenceT1[R, A any](a Reader[R, A]) Reader[R, T.Tuple1[A]]

func SequenceT2 

func SequenceT2[R, A, B any](a Reader[R, A], b Reader[R, B]) Reader[R, T.Tuple2[A, B]]

func SequenceT3 

func SequenceT3[R, A, B, C any](a Reader[R, A], b Reader[R, B], c Reader[R, C]) Reader[R, T.Tuple3[A, B, C]]

func SequenceT4 

func SequenceT4[R, A, B, C, D any](a Reader[R, A], b Reader[R, B], c Reader[R, C], d Reader[R, D]) Reader[R, T.Tuple4[A, B, C, D]]

Source Files

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Code generated by go generate; DO NOT EDIT.
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