cyclops.companion.reactor

Class Monos.Instances

java.lang.Object

cyclops.companion.reactor.Monos.Instances

Enclosing class:

Monos

public static class Monos.Instances
extends java.lang.Object

Companion class for creating Type Class instances for working with Monos

Constructor Summary

Constructors

Constructor and Description
Instances()

Method Summary

Modifier and Type	Method and Description
static <T,R> Applicative<ReactorWitness.mono>	applicative() import static com.aol.cyclops.hkt.jdk.MonoKind.widen; import static com.aol.cyclops.util.function.Lambda.l1; import static java.util.Arrays.asMono; Monos.applicative() .ap(widen(asMono(l1(this::multiplyByTwo))),widen(Mono.just(3))); //[6]
static <T> Comonad<ReactorWitness.mono>	comonad()
static InstanceDefinitions<ReactorWitness.mono>	definitions()
static <T> Foldable<ReactorWitness.mono>	foldable() int sum = Monos.foldable() .foldLeft(0, (a,b)->a+b, MonoKind.widen(Arrays.asMono(1,2,3,4))); //10
static <T,R> Functor<ReactorWitness.mono>	functor() Transform a Mono, mulitplying every element by 2
static <T,R> Monad<ReactorWitness.mono>	monad() import static com.aol.cyclops.hkt.jdk.MonoKind.widen; MonoKind<Integer> ft = Monos.monad() .flatMap(i->widen(Mono.just(i)), widen(Mono.just(3))) .convert(MonoKind::narrowK);
static <T> MonadPlus<ReactorWitness.mono>	monadPlus() Combines Monos by selecting the first result returned
static <T> MonadPlus<ReactorWitness.mono>	monadPlus(Monoid<Higher<ReactorWitness.mono,T>> m)
static <T> MonadPlus<ReactorWitness.mono>	monadPlusK(Monoid<MonoKind<T>> m) Monoid<MonoKind<Integer>> m = Monoid.of(MonoKind.widen(Arrays.asMono()), (a,b)->a.isEmpty() ? b : a); MonoKind<Integer> ft = Monos.<Integer>monadPlus(m) .plus(MonoKind.widen(Arrays.asMono(5)), MonoKind.widen(Arrays.asMono(10))) .convert(MonoKind::narrowK); //Arrays.asMono(5))
static <T> MonadRec<ReactorWitness.mono>	monadRec()
static <T,R> MonadZero<ReactorWitness.mono>	monadZero() MonoKind<String> ft = Monos.unit() .unit("hello") .then(h->Monos.monadZero().filter((String t)->t.startsWith("he"), h)) .convert(MonoKind::narrowK); //Mono.just("hello"));
static <C2,T> Traverse<ReactorWitness.mono>	traverse()
static <T> Pure<ReactorWitness.mono>	unit() MonoKind<String> ft = Monos.unit() .unit("hello") .convert(MonoKind::narrowK); //Mono["hello"]

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Instances

public Instances()

Method Detail

definitions

public static InstanceDefinitions<ReactorWitness.mono> definitions()

functor

public static <T,R> Functor<ReactorWitness.mono> functor()

Transform a Mono, mulitplying every element by 2

 
  MonoKind<Integer> future = Monos.functor().map(i->i*2, MonoKind.widen(Mono.just(3));

  //[6]


 
 

An example fluent api working with Monos

 
   MonoKind<Integer> ft = Monos.unit()
        .unit("hello")
        .then(h->Monos.functor().map((String v) ->v.length(), h))
        .convert(MonoKind::narrowK);

 
 

Returns:

A functor for Monos

unit

public static <T> Pure<ReactorWitness.mono> unit()

 
 MonoKind<String> ft = Monos.unit()
        .unit("hello")
        .convert(MonoKind::narrowK);

        //Mono["hello"]

 
 

Returns:

A factory for Monos

applicative

public static <T,R> Applicative<ReactorWitness.mono> applicative()

 
 import static com.aol.cyclops.hkt.jdk.MonoKind.widen;
 import static com.aol.cyclops.util.function.Lambda.l1;
 import static java.util.Arrays.asMono;

        Monos.applicative()
        .ap(widen(asMono(l1(this::multiplyByTwo))),widen(Mono.just(3)));

 //[6]
 
 

Example fluent API

 
 MonoKind<Function<Integer,Integer>> ftFn =Monos.unit()
                                                  .unit(Lambda.l1((Integer i) ->i*2))
                                                  .convert(MonoKind::narrowK);

        MonoKind<Integer> ft = Monos.unit()
        .unit("hello")
        .then(h->Monos.functor().map((String v) ->v.length(), h))
        .then(h->Monos.applicative().ap(ftFn, h))
        .convert(MonoKind::narrowK);

        //Mono.just("hello".length()*2))

 
 

Returns:

A zipper for Monos

monad

public static <T,R> Monad<ReactorWitness.mono> monad()

 
 import static com.aol.cyclops.hkt.jdk.MonoKind.widen;
 MonoKind<Integer> ft  = Monos.monad()
        .flatMap(i->widen(Mono.just(i)), widen(Mono.just(3)))
        .convert(MonoKind::narrowK);
 
 

Example fluent API

 
    MonoKind<Integer> ft = Monos.unit()
        .unit("hello")
        .then(h->Monos.monad().flatMap((String v) ->Monos.unit().unit(v.length()), h))
        .convert(MonoKind::narrowK);

        //Mono.just("hello".length())

 
 

Returns:

Type class with monad functions for Monos

monadZero

public static <T,R> MonadZero<ReactorWitness.mono> monadZero()

 
  MonoKind<String> ft = Monos.unit()
        .unit("hello")
        .then(h->Monos.monadZero().filter((String t)->t.startsWith("he"), h))
        .convert(MonoKind::narrowK);

        //Mono.just("hello"));

 
 

Returns:

A filterable monad (with default value)

monadPlus

public static <T> MonadPlus<ReactorWitness.mono> monadPlus()

Combines Monos by selecting the first result returned

 
  MonoKind<Integer> ft = Monos.<Integer>monadPlus()
        .plus(MonoKind.widen(Mono.empty()), MonoKind.widen(Mono.just(10)))
        .convert(MonoKind::narrowK);
        //Mono.empty()

 
 

Returns:

Type class for combining Monos by concatenation

monadPlusK

public static <T> MonadPlus<ReactorWitness.mono> monadPlusK(Monoid<MonoKind<T>> m)

 
  Monoid<MonoKind<Integer>> m = Monoid.of(MonoKind.widen(Arrays.asMono()), (a,b)->a.isEmpty() ? b : a);
        MonoKind<Integer> ft = Monos.<Integer>monadPlus(m)
        .plus(MonoKind.widen(Arrays.asMono(5)), MonoKind.widen(Arrays.asMono(10)))
        .convert(MonoKind::narrowK);
        //Arrays.asMono(5))

 
 

Parameters:

m - Monoid to use for combining Monos

Returns:

Type class for combining Monos

monadRec

public static <T> MonadRec<ReactorWitness.mono> monadRec()

monadPlus

public static <T> MonadPlus<ReactorWitness.mono> monadPlus(Monoid<Higher<ReactorWitness.mono,T>> m)

traverse

public static <C2,T> Traverse<ReactorWitness.mono> traverse()

Returns:

Type class for traversables with traverse / sequence operations

foldable

public static <T> Foldable<ReactorWitness.mono> foldable()

 
 int sum  = Monos.foldable()
        .foldLeft(0, (a,b)->a+b, MonoKind.widen(Arrays.asMono(1,2,3,4)));

        //10

 
 

Returns:

Type class for folding / reduction operations

comonad

public static <T> Comonad<ReactorWitness.mono> comonad()