cyclops.collections.immutable

Class PVectorX.Instances

java.lang.Object

cyclops.collections.immutable.PVectorX.Instances

Enclosing interface:

PVectorX<T>

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

Companion class for creating Type Class instances for working with PVectors

Constructor Summary

Constructors

Constructor and Description
Instances()

Method Summary

Modifier and Type	Method and Description
static <T> Foldable<PVectorX.µ>	foldable() int sum = PVectors.foldable() .foldLeft(0, (a,b)->a+b, Arrays.asPVector(1,2,3,4))); //10
static <T,R> Functor<PVectorX.µ>	functor() Transform a list, mulitplying every element by 2
static <T,R> Monad<PVectorX.µ>	monad() import static com.aol.cyclops.hkt.jdk.PVectorX.widen; PVectorX<Integer> list = PVectors.monad() .flatMap(i->widen(PVectorX.range(0,i)), widen(Arrays.asPVector(1,2,3))) .convert(PVectorX::narrowK);
static <T> MonadPlus<PVectorX.µ>	monadPlus() PVectorX<Integer> list = PVectors.<Integer>monadPlus() .plus(Arrays.asPVector()), Arrays.asPVector(10))) .convert(PVectorX::narrowK); //Arrays.asPVector(10))
static <T> MonadPlus<PVectorX.µ>	monadPlus(Monoid<PVectorX<T>> m) Monoid<PVectorX<Integer>> m = Monoid.of(Arrays.asPVector()), (a,b)->a.isEmpty() ? b : a); PVectorX<Integer> list = PVectors.<Integer>monadPlus(m) .plus(Arrays.asPVector(5)), Arrays.asPVector(10))) .convert(PVectorX::narrowK); //Arrays.asPVector(5))
static <T,R> MonadZero<PVectorX.µ>	monadZero() PVectorX<String> list = PVectors.unit() .unit("hello") .transform(h->PVectors.monadZero().filter((String t)->t.startsWith("he"), h)) .convert(PVectorX::narrowK); //Arrays.asPVector("hello"));
static <C2,T> Traverse<PVectorX.µ>	traverse()
static <T> Pure<PVectorX.µ>	unit() PVectorX<String> list = PVectors.unit() .unit("hello") .convert(PVectorX::narrowK); //Arrays.asPVector("hello"))
static <T,R> Applicative<PVectorX.µ>	zippingApplicative() import static com.aol.cyclops.hkt.jdk.PVectorX.widen; import static com.aol.cyclops.util.function.Lambda.l1; import static java.util.Arrays.asPVector; PVectors.zippingApplicative() .ap(widen(asPVector(l1(this::multiplyByTwo))),widen(asPVector(1,2,3))); //[2,4,6]

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

functor

public static <T,R> Functor<PVectorX.µ> functor()

Transform a list, mulitplying every element by 2

 
  PVectorX<Integer> list = PVectors.functor().map(i->i*2, Arrays.asPVector(1,2,3));

  //[2,4,6]


 
 

An example fluent api working with PVectors

 
   PVectorX<Integer> list = PVectors.unit()
        .unit("hello")
        .transform(h->PVectors.functor().map((String v) ->v.length(), h))
        .convert(PVectorX::narrowK);

 
 

Returns:

A functor for PVectors

unit

public static <T> Pure<PVectorX.µ> unit()

 
 PVectorX<String> list = PVectors.unit()
        .unit("hello")
        .convert(PVectorX::narrowK);

        //Arrays.asPVector("hello"))

 
 

Returns:

A factory for PVectors

zippingApplicative

public static <T,R> Applicative<PVectorX.µ> zippingApplicative()

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

        PVectors.zippingApplicative()
        .ap(widen(asPVector(l1(this::multiplyByTwo))),widen(asPVector(1,2,3)));

 //[2,4,6]
 
 

Example fluent API

 
 PVectorX<Function<Integer,Integer>> listFn =PVectors.unit()
                                                  .unit(Lambda.l1((Integer i) ->i*2))
                                                  .convert(PVectorX::narrowK);

        PVectorX<Integer> list = PVectors.unit()
        .unit("hello")
        .transform(h->PVectors.functor().map((String v) ->v.length(), h))
        .transform(h->PVectors.zippingApplicative().ap(listFn, h))
        .convert(PVectorX::narrowK);

        //Arrays.asPVector("hello".length()*2))

 
 

Returns:

A zipper for PVectors

monad

public static <T,R> Monad<PVectorX.µ> monad()

 
 import static com.aol.cyclops.hkt.jdk.PVectorX.widen;
 PVectorX<Integer> list  = PVectors.monad()
        .flatMap(i->widen(PVectorX.range(0,i)), widen(Arrays.asPVector(1,2,3)))
        .convert(PVectorX::narrowK);
 
 

Example fluent API

 
    PVectorX<Integer> list = PVectors.unit()
        .unit("hello")
        .transform(h->PVectors.monad().flatMap((String v) ->PVectors.unit().unit(v.length()), h))
        .convert(PVectorX::narrowK);

        //Arrays.asPVector("hello".length())

 
 

Returns:

Type class with monad functions for PVectors

monadZero

public static <T,R> MonadZero<PVectorX.µ> monadZero()

 
  PVectorX<String> list = PVectors.unit()
        .unit("hello")
        .transform(h->PVectors.monadZero().filter((String t)->t.startsWith("he"), h))
        .convert(PVectorX::narrowK);

        //Arrays.asPVector("hello"));

 
 

Returns:

A filterable monad (with default value)

monadPlus

public static <T> MonadPlus<PVectorX.µ> monadPlus()

 
  PVectorX<Integer> list = PVectors.<Integer>monadPlus()
        .plus(Arrays.asPVector()), Arrays.asPVector(10)))
        .convert(PVectorX::narrowK);
        //Arrays.asPVector(10))

 
 

Returns:

Type class for combining PVectors by concatenation

monadPlus

public static <T> MonadPlus<PVectorX.µ> monadPlus(Monoid<PVectorX<T>> m)

 
  Monoid<PVectorX<Integer>> m = Monoid.of(Arrays.asPVector()), (a,b)->a.isEmpty() ? b : a);
        PVectorX<Integer> list = PVectors.<Integer>monadPlus(m)
        .plus(Arrays.asPVector(5)), Arrays.asPVector(10)))
        .convert(PVectorX::narrowK);
        //Arrays.asPVector(5))

 
 

Parameters:

m - Monoid to use for combining PVectors

Returns:

Type class for combining PVectors

traverse

public static <C2,T> Traverse<PVectorX.µ> traverse()

Returns:

Type class for traversables with traverse / sequence operations

foldable

public static <T> Foldable<PVectorX.µ> foldable()

 
 int sum  = PVectors.foldable()
        .foldLeft(0, (a,b)->a+b, Arrays.asPVector(1,2,3,4)));

        //10

 
 

Returns:

Type class for folding / reduction operations