Constructor and Description |
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Instances() |
Modifier and Type | Method and Description |
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static InstanceDefinitions<Witness.list> |
definitions() |
static <T> Foldable<Witness.list> |
foldable()
int sum = Lists.foldable()
.foldLeft(0, (a,b)->a+b, ListX.widen(Arrays.asList(1,2,3,4)));
//10
|
static <T,R> Functor<Witness.list> |
functor()
Transform a list, mulitplying every element by 2
|
static <T,R> Monad<Witness.list> |
monad()
import static com.aol.cyclops2.hkt.jdk.ListX.widen;
ListX<Integer> list = Lists.monad()
.flatMap(i->widen(ListX.range(0,i)), widen(Arrays.asList(1,2,3)))
.convert(ListX::narrowK3);
|
static <T> MonadPlus<Witness.list> |
monadPlus()
ListX<Integer> list = Lists.<Integer>monadPlus()
.plus(ListX.widen(Arrays.asList()), ListX.widen(Arrays.asList(10)))
.convert(ListX::narrowK3);
//Arrays.asList(10))
|
static <T> MonadPlus<Witness.list> |
monadPlus(Monoid<ListX<T>> m)
Monoid<ListX<Integer>> m = Monoid.of(ListX.widen(Arrays.asList()), (a,b)->a.isEmpty() ? b : a);
ListX<Integer> list = Lists.<Integer>monadPlus(m)
.plus(ListX.widen(Arrays.asList(5)), ListX.widen(Arrays.asList(10)))
.convert(ListX::narrowK3);
//Arrays.asList(5))
|
static <T,R> MonadRec<Witness.list> |
monadRec() |
static <T,R> MonadZero<Witness.list> |
monadZero()
ListX<String> list = Lists.unit()
.unit("hello")
.applyHKT(h->Lists.monadZero().filter((String t)->t.startsWith("he"), h))
.convert(ListX::narrowK3);
//Arrays.asList("hello"));
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static <T> ListX<T> |
narrow(Higher<Witness.list,T> completableList)
Convert the HigherKindedType definition for a List into
|
static <T> ListX<T> |
narrowK(Higher<Witness.list,T> future)
Convert the raw Higher Kinded Type for ListType types into the ListType type definition class
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static <C2,T> Traverse<Witness.list> |
traverse() |
static Unfoldable<Witness.list> |
unfoldable() |
static <T> Pure<Witness.list> |
unit()
ListX<String> list = Lists.unit()
.unit("hello")
.convert(ListX::narrowK3);
//Arrays.asList("hello"))
|
static <T> Higher<Witness.list,T> |
widen(ListX<T> flux) |
static <C2,T> Higher<C2,Higher<Witness.list,T>> |
widen2(Higher<C2,ListX<T>> flux)
Widen a ListType nest inside another HKT encoded type
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static <T,R> Applicative<Witness.list> |
zippingApplicative()
import static com.aol.cyclops2.hkt.jdk.ListX.widen;
import static com.aol.cyclops2.util.function.Lambda.l1;
import static java.util.Arrays.asList;
Lists.zippingApplicative()
.ap(widen(asList(l1(this::multiplyByTwo))),widen(asList(1,2,3)));
//[2,4,6]
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public static InstanceDefinitions<Witness.list> definitions()
public static Unfoldable<Witness.list> unfoldable()
public static <T,R> Functor<Witness.list> functor()
ListX<Integer> list = Lists.functor().map(i->i*2, ListX.widen(Arrays.asList(1,2,3));
//[2,4,6]
An example fluent api working with Lists
ListX<Integer> list = Lists.unit()
.unit("hello")
.applyHKT(h->Lists.functor().map((String v) ->v.length(), h))
.convert(ListX::narrowK3);
public static <T> Pure<Witness.list> unit()
ListX<String> list = Lists.unit()
.unit("hello")
.convert(ListX::narrowK3);
//Arrays.asList("hello"))
public static <T,R> Applicative<Witness.list> zippingApplicative()
import static com.aol.cyclops2.hkt.jdk.ListX.widen;
import static com.aol.cyclops2.util.function.Lambda.l1;
import static java.util.Arrays.asList;
Lists.zippingApplicative()
.ap(widen(asList(l1(this::multiplyByTwo))),widen(asList(1,2,3)));
//[2,4,6]
Example fluent API
ListX<Function<Integer,Integer>> listFn =Lists.unit()
.unit(Lambda.l1((Integer i) ->i*2))
.convert(ListX::narrowK3);
ListX<Integer> list = Lists.unit()
.unit("hello")
.applyHKT(h->Lists.functor().map((String v) ->v.length(), h))
.applyHKT(h->Lists.zippingApplicative().ap(listFn, h))
.convert(ListX::narrowK3);
//Arrays.asList("hello".length()*2))
public static <T,R> Monad<Witness.list> monad()
import static com.aol.cyclops2.hkt.jdk.ListX.widen;
ListX<Integer> list = Lists.monad()
.flatMap(i->widen(ListX.range(0,i)), widen(Arrays.asList(1,2,3)))
.convert(ListX::narrowK3);
Example fluent API
ListX<Integer> list = Lists.unit()
.unit("hello")
.applyHKT(h->Lists.monad().flatMap((String v) ->Lists.unit().unit(v.length()), h))
.convert(ListX::narrowK3);
//Arrays.asList("hello".length())
public static <T,R> MonadRec<Witness.list> monadRec()
public static <T,R> MonadZero<Witness.list> monadZero()
ListX<String> list = Lists.unit()
.unit("hello")
.applyHKT(h->Lists.monadZero().filter((String t)->t.startsWith("he"), h))
.convert(ListX::narrowK3);
//Arrays.asList("hello"));
public static <T> MonadPlus<Witness.list> monadPlus()
ListX<Integer> list = Lists.<Integer>monadPlus()
.plus(ListX.widen(Arrays.asList()), ListX.widen(Arrays.asList(10)))
.convert(ListX::narrowK3);
//Arrays.asList(10))
public static <T> MonadPlus<Witness.list> monadPlus(Monoid<ListX<T>> m)
Monoid<ListX<Integer>> m = Monoid.of(ListX.widen(Arrays.asList()), (a,b)->a.isEmpty() ? b : a);
ListX<Integer> list = Lists.<Integer>monadPlus(m)
.plus(ListX.widen(Arrays.asList(5)), ListX.widen(Arrays.asList(10)))
.convert(ListX::narrowK3);
//Arrays.asList(5))
m
- Monoid to use for combining Listspublic static <C2,T> Traverse<Witness.list> traverse()
public static <T> Foldable<Witness.list> foldable()
int sum = Lists.foldable()
.foldLeft(0, (a,b)->a+b, ListX.widen(Arrays.asList(1,2,3,4)));
//10
public static <C2,T> Higher<C2,Higher<Witness.list,T>> widen2(Higher<C2,ListX<T>> flux)
flux
- HTK encoded type containing a List to widenpublic static <T> Higher<Witness.list,T> widen(ListX<T> flux)
public static <T> ListX<T> narrowK(Higher<Witness.list,T> future)
future
- HKT encoded list into a ListTypepublic static <T> ListX<T> narrow(Higher<Witness.list,T> completableList)
List
- Type Constructor to convert back into narrowed type