Constructor and Description |
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Instances() |
Modifier and Type | Method and Description |
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static <T,R> Applicative<Eval.µ> |
applicative()
import static com.aol.cyclops.hkt.jdk.Eval.widen;
import static com.aol.cyclops.util.function.Lambda.l1;
import static java.util.Arrays.asEval;
Evals.zippingApplicative()
.ap(widen(asEval(l1(this::multiplyByTwo))),widen(asEval(1,2,3)));
//[2,4,6]
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static <T> Comonad<Eval.µ> |
comonad() |
static <T> Foldable<Eval.µ> |
foldable()
int sum = Evals.foldable()
.foldLeft(0, (a,b)->a+b, Eval.widen(Arrays.asEval(1,2,3,4)));
//10
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static <T,R> Functor<Eval.µ> |
functor()
Transform a list, mulitplying every element by 2
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static <T,R> Monad<Eval.µ> |
monad()
import static com.aol.cyclops.hkt.jdk.Eval.widen;
Eval<Integer> list = Evals.monad()
.flatMap(i->widen(EvalX.range(0,i)), widen(Arrays.asEval(1,2,3)))
.convert(Eval::narrowK);
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static <T> MonadPlus<Eval.µ> |
monadPlus()
Eval<Integer> list = Evals.<Integer>monadPlus()
.plus(Eval.widen(Arrays.asEval()), Eval.widen(Arrays.asEval(10)))
.convert(Eval::narrowK);
//Arrays.asEval(10))
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static <T> MonadPlus<Eval.µ> |
monadPlus(Monoid<Eval<T>> m)
Monoid<Eval<Integer>> m = Monoid.of(Eval.widen(Arrays.asEval()), (a,b)->a.isEmpty() ? b : a);
Eval<Integer> list = Evals.<Integer>monadPlus(m)
.plus(Eval.widen(Arrays.asEval(5)), Eval.widen(Arrays.asEval(10)))
.convert(Eval::narrowK);
//Arrays.asEval(5))
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static <T,R> MonadZero<Eval.µ> |
monadZero()
Eval<String> list = Evals.unit()
.unit("hello")
.transform(h->Evals.monadZero().filter((String t)->t.startsWith("he"), h))
.convert(Eval::narrowK);
//Arrays.asEval("hello"));
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static <C2,T> Traverse<Eval.µ> |
traverse() |
static <T> Pure<Eval.µ> |
unit()
Eval<String> list = Evals.unit()
.unit("hello")
.convert(Eval::narrowK);
//Arrays.asEval("hello"))
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public static <T,R> Functor<Eval.µ> functor()
Eval<Integer> list = Evals.functor().map(i->i*2, Eval.widen(Arrays.asEval(1,2,3));
//[2,4,6]
An example fluent api working with Evals
Eval<Integer> list = Evals.unit()
.unit("hello")
.transform(h->Evals.functor().map((String v) ->v.length(), h))
.convert(Eval::narrowK);
public static <T> Pure<Eval.µ> unit()
Eval<String> list = Evals.unit()
.unit("hello")
.convert(Eval::narrowK);
//Arrays.asEval("hello"))
public static <T,R> Applicative<Eval.µ> applicative()
import static com.aol.cyclops.hkt.jdk.Eval.widen;
import static com.aol.cyclops.util.function.Lambda.l1;
import static java.util.Arrays.asEval;
Evals.zippingApplicative()
.ap(widen(asEval(l1(this::multiplyByTwo))),widen(asEval(1,2,3)));
//[2,4,6]
Example fluent API
Eval<Function<Integer,Integer>> listFn =Evals.unit()
.unit(Lambda.l1((Integer i) ->i*2))
.convert(Eval::narrowK);
Eval<Integer> list = Evals.unit()
.unit("hello")
.transform(h->Evals.functor().map((String v) ->v.length(), h))
.transform(h->Evals.applicative().ap(listFn, h))
.convert(Eval::narrowK);
//Arrays.asEval("hello".length()*2))
public static <T,R> Monad<Eval.µ> monad()
import static com.aol.cyclops.hkt.jdk.Eval.widen;
Eval<Integer> list = Evals.monad()
.flatMap(i->widen(EvalX.range(0,i)), widen(Arrays.asEval(1,2,3)))
.convert(Eval::narrowK);
Example fluent API
Eval<Integer> list = Evals.unit()
.unit("hello")
.transform(h->Evals.monad().flatMap((String v) ->Evals.unit().unit(v.length()), h))
.convert(Eval::narrowK);
//Arrays.asEval("hello".length())
public static <T,R> MonadZero<Eval.µ> monadZero()
Eval<String> list = Evals.unit()
.unit("hello")
.transform(h->Evals.monadZero().filter((String t)->t.startsWith("he"), h))
.convert(Eval::narrowK);
//Arrays.asEval("hello"));
public static <T> MonadPlus<Eval.µ> monadPlus()
Eval<Integer> list = Evals.<Integer>monadPlus()
.plus(Eval.widen(Arrays.asEval()), Eval.widen(Arrays.asEval(10)))
.convert(Eval::narrowK);
//Arrays.asEval(10))
public static <T> MonadPlus<Eval.µ> monadPlus(Monoid<Eval<T>> m)
Monoid<Eval<Integer>> m = Monoid.of(Eval.widen(Arrays.asEval()), (a,b)->a.isEmpty() ? b : a);
Eval<Integer> list = Evals.<Integer>monadPlus(m)
.plus(Eval.widen(Arrays.asEval(5)), Eval.widen(Arrays.asEval(10)))
.convert(Eval::narrowK);
//Arrays.asEval(5))
m
- Monoid to use for combining Evalspublic static <C2,T> Traverse<Eval.µ> traverse()
public static <T> Foldable<Eval.µ> foldable()
int sum = Evals.foldable()
.foldLeft(0, (a,b)->a+b, Eval.widen(Arrays.asEval(1,2,3,4)));
//10