cyclops.control

Interface Maybe<T>

Type Parameters:

T - Data type of element stored in Maybe

All Superinterfaces:

Convert<Higher<Maybe.µ,T>>, Convertable<T>, ConvertableToReactiveSeq<T>, Filters<T>, Fn0<T>, Folds<T>, org.jooq.lambda.function.Function0<T>, Higher<Maybe.µ,T>, java.lang.Iterable<T>, MonadicValue<T>, java.util.function.Predicate<T>, org.reactivestreams.Publisher<T>, java.util.function.Supplier<T>, To<Maybe<T>>, ToStream<T>, Transformable<T>, Unit<T>, Value<T>, Visitable<T>, Zippable<T>

All Known Implementing Classes:

Maybe.Just, Maybe.Lazy, Maybe.Nothing

public interface Maybe<T>
extends To<Maybe<T>>, MonadicValue<T>, Higher<Maybe.µ,T>

Totally lazy more powerful general Option(al) type. Maybe is lazy like a Java 8 Stream that represents 0 or 1 values rather than eager like a Java 8 Optional. map / peek/ filter and flatMap build the execution chaing, but are not executed until the value inside the Maybe is required. The Maybe interface has two implementations Some which holds a value and None which represents no value

  
    
    //eagerly load data
    Optional.of(10)
            .map(this::load);
    
    //lazily tee up loading of data until needed
    Maybe.of(10)
         .map(this::load);        
            .
 
 
 

Maybe is tail recursive

 {@code

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Maybe.µ
static class	Maybe.Instances Companion class for creating Type Class instances for working with Maybes
static class	Maybe.Just<T>
static class	Maybe.Lazy<T>
static class	Maybe.Nothing<T>

Nested classes/interfaces inherited from interface com.aol.cyclops2.types.Value

Value.ValueImpl<T>

Nested classes/interfaces inherited from interface com.aol.cyclops2.types.Convertable

Convertable.SupplierToConvertable<T>

Nested classes/interfaces inherited from interface cyclops.function.Fn0

Fn0.FunctionalOperations<R>, Fn0.SupplierKind<R>

Field Summary

Fields

Modifier and Type	Field and Description
static Maybe	EMPTY

Method Summary

Modifier and Type	Method and Description
static <T,R> Maybe<R>	accumulateJust(CollectionX<Maybe<T>> maybes, java.util.function.Function<? super T,R> mapper, Monoid<R> reducer) Accumulate the results only from those Maybes which have a value present, using the supplied mapping function to convert the data from each Maybe before reducing them using the supplied Monoid (a combining BiFunction/BinaryOperator and identity element that takes two input values of the same type and returns the combined result) cyclops2.Monoids ..
static <T,R> Maybe<R>	accumulateJust(CollectionX<Maybe<T>> maybes, Reducer<R> reducer) Accummulating operation using the supplied Reducer (@see cyclops2.Reducers).
static <T> Maybe<T>	accumulateJust(Monoid<T> reducer, CollectionX<Maybe<T>> maybes) Accumulate the results only from those Maybes which have a value present, using the supplied Monoid (a combining BiFunction/BinaryOperator and identity element that takes two input values of the same type and returns the combined result) cyclops2.Monoids .
default AnyM<Witness.maybe,T>	anyM()
static <T,R> java.util.function.Function<? super T,? extends Maybe<R>>	arrow(java.util.function.Function<? super T,? extends R> fn)
default <U> Maybe<U>	cast(java.lang.Class<? extends U> type) Cast all elements in a stream to a given type, possibly throwing a ClassCastException.
default <R> Maybe<R>	coflatMap(java.util.function.Function<? super MonadicValue<T>,R> mapper) Perform a coflatMap operation.
default <T2,R> Maybe<R>	combine(Value<? extends T2> app, java.util.function.BiFunction<? super T,? super T2,? extends R> fn) Lazily combine this ApplicativeFunctor with the supplied value via the supplied BiFunction Example
default Maybe<T>	combineEager(Monoid<T> monoid, MonadicValue<? extends T> v2) Eagerly combine two MonadicValues using the supplied monoid (@see ApplicativeFunctor for type appropraite i.e.
Maybe<T>	filter(java.util.function.Predicate<? super T> fn) Keep only elements for which the supplied predicates hold e.g.
default Maybe<T>	filterNot(java.util.function.Predicate<? super T> fn) Remove any elements for which the predicate holds (inverse operation to filter) e.g.
<R> Maybe<R>	flatMap(java.util.function.Function<? super T,? extends MonadicValue<? extends R>> mapper) A flattening transformation operation (@see Optional.flatMap(Function)
default <R> Maybe<R>	flatMapI(java.util.function.Function<? super T,? extends java.lang.Iterable<? extends R>> mapper) A flattening transformation operation that takes the first value from the returned Iterable.
default <R> Maybe<R>	flatMapP(java.util.function.Function<? super T,? extends org.reactivestreams.Publisher<? extends R>> mapper) A flattening transformation operation that takes the first value from the returned Publisher.
default <R> Maybe<R>	flatMapS(java.util.function.Function<? super T,? extends java.util.stream.Stream<? extends R>> mapper)
default <R1,R> Maybe<R>	forEach2(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,? extends R> yieldingFunction) Perform a two level nested internal iteration over this MonadicValue and the supplied MonadicValue
default <R1,R> Maybe<R>	forEach2(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,java.lang.Boolean> filterFunction, java.util.function.BiFunction<? super T,? super R1,? extends R> yieldingFunction) Perform a two level nested internal iteration over this MonadicValue and the supplied stream
default <T2,R1,R2,R> Maybe<R>	forEach3(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2, Fn3<? super T,? super R1,? super R2,? extends R> yieldingFunction) Perform a three level nested internal iteration over this MonadicValue and the supplied MonadicValues
default <T2,R1,R2,R> Maybe<R>	forEach3(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2, Fn3<? super T,? super R1,? super R2,java.lang.Boolean> filterFunction, Fn3<? super T,? super R1,? super R2,? extends R> yieldingFunction) Perform a three level nested internal iteration over this MonadicValue and the supplied MonadicValues
default <T2,R1,R2,R3,R> Maybe<R>	forEach4(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2, Fn3<? super T,? super R1,? super R2,? extends MonadicValue<R3>> value3, Fn4<? super T,? super R1,? super R2,? super R3,? extends R> yieldingFunction) Perform a four level nested internal iteration over this MonadicValue and the supplied MonadicValues
default <T2,R1,R2,R3,R> Maybe<R>	forEach4(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1, java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2, Fn3<? super T,? super R1,? super R2,? extends MonadicValue<R3>> value3, Fn4<? super T,? super R1,? super R2,? super R3,java.lang.Boolean> filterFunction, Fn4<? super T,? super R1,? super R2,? super R3,? extends R> yieldingFunction) Perform a four level nested internal iteration over this MonadicValue and the supplied MonadicValues Maybe.of(3) .forEach4(a->Maybe.just(a+10), (a,b)->Maybe.just(a+b), (a,b,c)->Maybe.none(), (a,b,c,d)->a+b+c<100, (a,b,c,d)->a+b+c+d); //Maybe.none
static <T> Maybe<T>	fromEval(Eval<T> eval) Construct a Maybe from the supplied Eval
static <T> Maybe<T>	fromEvalNullable(Eval<T> eval)
static <T> Maybe<T>	fromEvalOf(Eval<T> eval) Deprecated.
static <T> Maybe<T>	fromEvalOptional(Eval<java.util.Optional<T>> value)
static <T> Maybe<T>	fromIterable(java.lang.Iterable<T> iterable) Construct a Maybe that contains a single value extracted from the supplied Iterable
static <T> Maybe<T>	fromLazy(Eval<Maybe<T>> lazy)
static <T> Maybe<T>	fromOptional(Higher<OptionalKind.µ,T> optional) Construct an equivalent Maybe from the Supplied Optional
static <T> Maybe<T>	fromOptional(java.util.Optional<T> opt) Construct an equivalent Maybe from the Supplied Optional
static <T> Maybe<T>	fromOptionalKind(OptionalKind<T> opt)
static <T> Maybe<T>	fromPublisher(org.reactivestreams.Publisher<T> pub) Construct a Maybe that contains a single value extracted from the supplied reactive-streams Publisher
static <R> Maybe<R>	fromStream(java.util.stream.Stream<? extends R> apply)
boolean	isPresent()
static <T> Maybe<T>	just(T value) Construct an Maybe which contains the provided (non-null) value.
<R> Maybe<R>	map(java.util.function.Function<? super T,? extends R> mapper) Transform this functor using the supplied transformation function
static <T> Maybe<T>	narrow(Maybe<? extends T> broad) Narrow covariant type parameter
static <T> Maybe<T>	narrowK(Higher<Maybe.µ,T> future) Convert the raw Higher Kinded Type for MaybeType types into the MaybeType type definition class
static <T> java.util.Optional<T>	narrowOptional(Higher<Maybe.µ,T> maybe) Convert the HigherKindedType definition for a Maybe into
default Maybe<MonadicValue<T>>	nest() cojoin pattern.
static <T> Maybe<T>	none()
default Maybe<T>	notNull() Filter elements retaining only values which are not null
static <T> Maybe<T>	of(T value) Construct an Maybe which contains the provided (non-null) value Equivalent to @see just(Object)
static <T> Maybe<T>	ofNullable(T value) Maybe<Integer> maybe = Maybe.ofNullable(null); //None Maybe<Integer> maybe = Maybe.ofNullable(10); //Maybe[10], Some[10]
default <U> Maybe<U>	ofType(java.lang.Class<? extends U> type) Keep only those elements in a stream that are of a given type.
default Maybe<T>	peek(java.util.function.Consumer<? super T> c) Peek at the current value of this Transformable, without transforming it
Maybe<T>	recover(java.util.function.Supplier<T> value)
Maybe<T>	recover(T value)
Maybe<T>	recoverWith(java.util.function.Supplier<? extends Maybe<T>> fn)
default <R> Maybe<R>	retry(java.util.function.Function<? super T,? extends R> fn) Retry a transformation if it fails.
default <R> Maybe<R>	retry(java.util.function.Function<? super T,? extends R> fn, int retries, long delay, java.util.concurrent.TimeUnit timeUnit) Retry a transformation if it fails.
static <T> Maybe<ListX<T>>	sequence(CollectionX<Maybe<T>> maybes) Sequence operation, take a Collection of Maybes and turn it into a Maybe with a Collection By constrast with sequenceJust(CollectionX) if any Maybe types are None / empty the return type will be an empty Maybe / None
static <T> Maybe<ReactiveSeq<T>>	sequence(java.util.stream.Stream<Maybe<T>> maybes) Sequence operation, take a Stream of Maybes and turn it into a Maybe with a Stream By constrast with sequenceJust(CollectionX) Maybe#empty/ None types are result in the returned Maybe being Maybe.empty / None
static <T> Maybe<ListX<T>>	sequenceJust(CollectionX<Maybe<T>> maybes) Sequence operation, take a Collection of Maybes and turn it into a Maybe with a Collection Only successes are retained.
default Maybe<T>	toMaybe() Returns a function result or a supplier result.
default <R> Maybe<R>	trampoline(java.util.function.Function<? super T,? extends Trampoline<? extends R>> mapper) Performs a map operation that can call a recursive method without running out of stack space
default <T> Maybe<T>	unit(T unit)
<R> R	visit(java.util.function.Function<? super T,? extends R> some, java.util.function.Supplier<? extends R> none) The provided function is executed with the value stored in this Visitable if one is present, otherwise the provided Supplier is executed instead.
static <C2,T> Higher<C2,Higher<Maybe.µ,T>>	widen2(Higher<C2,Maybe<T>> nestedMaybe)
default Maybe<T>	zip(java.util.function.BinaryOperator<Zippable<T>> combiner, Zippable<T> app) Combine two applicatives together using the provided BinaryOperator (Semigroup, Monoid and Reducer all extend BinaryOperator - checkout Semigroups and Monoids for a large number of canned combinations).
default <T2,R> Maybe<R>	zip(java.lang.Iterable<? extends T2> app, java.util.function.BiFunction<? super T,? super T2,? extends R> fn) Zip (combine) this Zippable with the supplied Iterable using the supplied combining function
default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>>	zip(java.lang.Iterable<? extends U> other) Zip (combine) this Zippable with the supplied Iterable combining both into a Tuple2
default <S,U> Maybe<org.jooq.lambda.tuple.Tuple3<T,S,U>>	zip3(java.lang.Iterable<? extends S> second, java.lang.Iterable<? extends U> third) zip 3 Streams into one
default <S,U,R> Maybe<R>	zip3(java.lang.Iterable<? extends S> second, java.lang.Iterable<? extends U> third, Fn3<? super T,? super S,? super U,? extends R> fn3)
default <T2,T3,T4> Maybe<org.jooq.lambda.tuple.Tuple4<T,T2,T3,T4>>	zip4(java.lang.Iterable<? extends T2> second, java.lang.Iterable<? extends T3> third, java.lang.Iterable<? extends T4> fourth) zip 4 Streams into 1
default <T2,T3,T4,R> Maybe<R>	zip4(java.lang.Iterable<? extends T2> second, java.lang.Iterable<? extends T3> third, java.lang.Iterable<? extends T4> fourth, Fn4<? super T,? super T2,? super T3,? super T4,? extends R> fn)
default <T2,R> Maybe<R>	zipP(org.reactivestreams.Publisher<? extends T2> app, java.util.function.BiFunction<? super T,? super T2,? extends R> fn) Zip (combine) this Zippable with the supplied Publisher, using the supplied combining function
default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>>	zipP(org.reactivestreams.Publisher<? extends U> other)
default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>>	zipS(java.util.stream.Stream<? extends U> other) Zip (combine) this Zippable with the supplied Stream combining both into a Tuple2
default <U,R> Maybe<R>	zipS(java.util.stream.Stream<? extends U> other, java.util.function.BiFunction<? super T,? super U,? extends R> zipper) Zip (combine) this Zippable with the supplied Stream, using the supplied combining function
default <R> Maybe<R>	zipWith(java.lang.Iterable<java.util.function.Function<? super T,? extends R>> fn)
default <R> Maybe<R>	zipWithP(org.reactivestreams.Publisher<java.util.function.Function<? super T,? extends R>> fn)
default <R> Maybe<R>	zipWithS(java.util.stream.Stream<java.util.function.Function<? super T,? extends R>> fn)

Methods inherited from interface com.aol.cyclops2.types.To

to

Methods inherited from interface com.aol.cyclops2.types.Value

apply, generate, iterate, iterator, mkString, newSubscriber, stream, subscribe, test, toEvalAlways, toEvalLater, toEvalNow, toIor, toTry, toTry, toTry, toXor, toXor

Methods inherited from interface com.aol.cyclops2.types.Folds

endsWith, endsWithIterable, findAny, findFirst, firstValue, foldLeft, foldLeft, foldLeft, foldLeft, foldRight, foldRight, foldRight, foldRightMapToType, get, groupBy, join, join, join, mapReduce, mapReduce, print, print, printErr, printOut, reduce, reduce, reduce, reduce, reduce, reduce, reduce, schedule, scheduleFixedDelay, scheduleFixedRate, single, single, singleOptional, startsWith, startsWithIterable, toConcurrentLazyCollection, toConcurrentLazyStreamable, toLazyCollection, xMatch

Methods inherited from interface com.aol.cyclops2.types.stream.ToStream

futureStream, getStreamable, isEmpty, jdkStream, reactiveSeq, reveresedJDKStream, reveresedStream

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface com.aol.cyclops2.types.Convertable

collect, fromSupplier, get, orElse, orElseGet, orElseThrow, toCompletableFuture, toCompletableFutureAsync, toCompletableFutureAsync, toFuture, toFutureWAsync, toFutureWAsync, toOptional, toStream

Methods inherited from interface cyclops.function.Fn0

andThen, fnTo, functionOps, lift, lift, liftF, liftOpt, liftTry, memoize, memoize, run, suspend, λ, λv

Methods inherited from interface org.jooq.lambda.function.Function0

apply, from, toSupplier

Methods inherited from interface java.util.function.Predicate

and, isEqual, negate, or

Methods inherited from interface com.aol.cyclops2.hkt.Higher

apply_, apply, transform

Methods inherited from interface com.aol.cyclops2.hkt.Convert

convert

Field Detail

EMPTY

static final Maybe EMPTY

Method Detail

anyM

default AnyM<Witness.maybe,T> anyM()

fromLazy

static <T> Maybe<T> fromLazy(Eval<Maybe<T>> lazy)

arrow

static <T,R> java.util.function.Function<? super T,? extends Maybe<R>> arrow(java.util.function.Function<? super T,? extends R> fn)

fromOptional

static <T> Maybe<T> fromOptional(Higher<OptionalKind.µ,T> optional)

Construct an equivalent Maybe from the Supplied Optional

 
   MaybeType<Integer> some = MaybeType.fromOptional(Optional.of(10));
   //Maybe[10], Some[10]

   MaybeType<Integer> none = MaybeType.fromOptional(Optional.empty());
   //Maybe.empty, None[]
 
 

Parameters:

opt - Optional to construct Maybe from

Returns:

Maybe created from Optional

widen2

static <C2,T> Higher<C2,Higher<Maybe.µ,T>> widen2(Higher<C2,Maybe<T>> nestedMaybe)

narrowK

static <T> Maybe<T> narrowK(Higher<Maybe.µ,T> future)

Convert the raw Higher Kinded Type for MaybeType types into the MaybeType type definition class

Parameters:

future - HKT encoded list into a MaybeType

Returns:

MaybeType

narrowOptional

static <T> java.util.Optional<T> narrowOptional(Higher<Maybe.µ,T> maybe)

Convert the HigherKindedType definition for a Maybe into

Parameters:

MaybeType - Constructor to convert back into narrowed type

Returns:

Optional from Higher Kinded Type

none

static <T> Maybe<T> none()

Returns:

Get the empty Maybe (single instance)

flatMapI

default <R> Maybe<R> flatMapI(java.util.function.Function<? super T,? extends java.lang.Iterable<? extends R>> mapper)

Description copied from interface: MonadicValue

A flattening transformation operation that takes the first value from the returned Iterable.

  
   Maybe.just(1).map(i->i+2).flatMapI(i->Arrays.asList(()->i*3,20);
   //Maybe[9]
 
 

Specified by:

flatMapI in interface MonadicValue<T>

Parameters:

mapper - transformation function

Returns:

MonadicValue

flatMapP

default <R> Maybe<R> flatMapP(java.util.function.Function<? super T,? extends org.reactivestreams.Publisher<? extends R>> mapper)

Description copied from interface: MonadicValue

A flattening transformation operation that takes the first value from the returned Publisher.

  
   FutureW.ofResult(1).map(i->i+2).flatMapP(i->Flux.just(()->i*3,20);
   //FutureW[9]
 
 

Specified by:

flatMapP in interface MonadicValue<T>

Parameters:

mapper - transformation function

Returns:

MonadicValue

fromPublisher

static <T> Maybe<T> fromPublisher(org.reactivestreams.Publisher<T> pub)

Construct a Maybe that contains a single value extracted from the supplied reactive-streams Publisher

  
   ReactiveSeq<Integer> stream =  ReactiveSeq.of(1,2,3);
        
        Maybe<Integer> maybe = Maybe.fromPublisher(stream);
        
        //Maybe[1]
 
 
 

Parameters:

pub - Publisher to extract value from

Returns:

Maybe populated with first value from Publisher (Maybe.empty if Publisher empty)

fromIterable

static <T> Maybe<T> fromIterable(java.lang.Iterable<T> iterable)

Construct a Maybe that contains a single value extracted from the supplied Iterable

  
   ReactiveSeq<Integer> stream =  ReactiveSeq.of(1,2,3);
        
        Maybe<Integer> maybe = Maybe.fromIterable(stream);
        
        //Maybe[1]
 
 
 

Parameters:

iterable - Iterable to extract value from

Returns:

Maybe populated with first value from Iterable (Maybe.empty if Publisher empty)

fromStream

static <R> Maybe<R> fromStream(java.util.stream.Stream<? extends R> apply)

fromOptional

static <T> Maybe<T> fromOptional(java.util.Optional<T> opt)

Construct an equivalent Maybe from the Supplied Optional

  
   Maybe<Integer> some = Maybe.fromOptional(Optional.of(10));
   //Maybe[10], Some[10]
  
   Maybe<Integer> none = Maybe.fromOptional(Optional.empty());
   //Maybe.empty, None[]
 
 

Parameters:

opt - Optional to construct Maybe from

Returns:

Maybe created from Optional

fromOptionalKind

static <T> Maybe<T> fromOptionalKind(OptionalKind<T> opt)

fromEvalOf

@Deprecated
static <T> Maybe<T> fromEvalOf(Eval<T> eval)

Deprecated.

fromEval

static <T> Maybe<T> fromEval(Eval<T> eval)

Construct a Maybe from the supplied Eval

  
     Maybe<Integer> maybe =  Maybe.fromEval(Eval.now(10));
     //Maybe[10]
      
 
 

Parameters:

eval - Eval to construct Maybe from

Returns:

Maybe created from Eval

fromEvalNullable

static <T> Maybe<T> fromEvalNullable(Eval<T> eval)

fromEvalOptional

static <T> Maybe<T> fromEvalOptional(Eval<java.util.Optional<T>> value)

just

static <T> Maybe<T> just(T value)

Construct an Maybe which contains the provided (non-null) value. Alias for @see of(Object)

  
 
    Maybe<Integer> some = Maybe.just(10);
    some.map(i->i*2);
 
 

Parameters:

value - Value to wrap inside a Maybe

Returns:

Maybe containing the supplied value

of

static <T> Maybe<T> of(T value)

Construct an Maybe which contains the provided (non-null) value Equivalent to @see just(Object)

  
 
    Maybe<Integer> some = Maybe.of(10);
    some.map(i->i*2);
 
 

Specified by:

of in interface Value<T>

Parameters:

value - Value to wrap inside a Maybe

Returns:

Maybe containing the supplied value

ofNullable

static <T> Maybe<T> ofNullable(T value)

  
    Maybe<Integer> maybe  = Maybe.ofNullable(null);
    //None
     
    Maybe<Integer> maybe = Maybe.ofNullable(10);
    //Maybe[10], Some[10]
 
 
 

Parameters:

value -

Returns:

narrow

static <T> Maybe<T> narrow(Maybe<? extends T> broad)

Narrow covariant type parameter

Parameters:

broad - Maybe with covariant type parameter

Returns:

Narrowed Maybe

sequenceJust

static <T> Maybe<ListX<T>> sequenceJust(CollectionX<Maybe<T>> maybes)

Sequence operation, take a Collection of Maybes and turn it into a Maybe with a Collection Only successes are retained. By constrast with sequence(CollectionX) Maybe#empty/ None types are tolerated and ignored.

  
  Maybe<Integer> just = Maybe.of(10);
        Maybe<Integer> none = Maybe.none();
 
 Maybe<ListX<Integer>> maybes = Maybe.sequenceJust(ListX.of(just, none, Maybe.of(1)));
       //Maybe.of(ListX.of(10, 1));
 
 

Parameters:

maybes - Maybes to Sequence

Returns:

Maybe with a List of values

sequence

static <T> Maybe<ListX<T>> sequence(CollectionX<Maybe<T>> maybes)

Sequence operation, take a Collection of Maybes and turn it into a Maybe with a Collection By constrast with sequenceJust(CollectionX) if any Maybe types are None / empty the return type will be an empty Maybe / None

 
 
  Maybe<Integer> just = Maybe.of(10);
        Maybe<Integer> none = Maybe.none();
  
  Maybe<ListX<Integer>> maybes = Maybe.sequence(ListX.of(just, none, Maybe.of(1)));
        //Maybe.none();
 
 
 

Parameters:

maybes - Maybes to Sequence

Returns:

Maybe with a List of values

sequence

static <T> Maybe<ReactiveSeq<T>> sequence(java.util.stream.Stream<Maybe<T>> maybes)

Sequence operation, take a Stream of Maybes and turn it into a Maybe with a Stream By constrast with sequenceJust(CollectionX) Maybe#empty/ None types are result in the returned Maybe being Maybe.empty / None

  
 
  Maybe<Integer> just = Maybe.of(10);
        Maybe<Integer> none = Maybe.none();
        
  Maybe<ReactiveSeq<Integer>> maybes = Maybe.sequence(Stream.of(just, none, Maybe.of(1)));
        //Maybe.none();
 
 
 

Parameters:

maybes - Maybes to Sequence

Returns:

Maybe with a Stream of values

accumulateJust

static <T,R> Maybe<R> accumulateJust(CollectionX<Maybe<T>> maybes,
                                     Reducer<R> reducer)

Accummulating operation using the supplied Reducer (@see cyclops2.Reducers). A typical use case is to accumulate into a Persistent Collection type. Accumulates the present results, ignores empty Maybes.

  
  Maybe<Integer> just = Maybe.of(10);
        Maybe<Integer> none = Maybe.none();
        
 Maybe<PSetX<Integer>> maybes = Maybe.accumulateJust(ListX.of(just, none, Maybe.of(1)), Reducers.toPSetX());
       //Maybe.of(PSetX.of(10, 1)));
 
 
 

Parameters:

maybes - Maybes to accumulate

reducer - Reducer to accumulate values with

Returns:

Maybe with reduced value

accumulateJust

static <T,R> Maybe<R> accumulateJust(CollectionX<Maybe<T>> maybes,
                                     java.util.function.Function<? super T,R> mapper,
                                     Monoid<R> reducer)

Accumulate the results only from those Maybes which have a value present, using the supplied mapping function to convert the data from each Maybe before reducing them using the supplied Monoid (a combining BiFunction/BinaryOperator and identity element that takes two input values of the same type and returns the combined result) cyclops2.Monoids ..

  
  Maybe<Integer> just = Maybe.of(10);
        Maybe<Integer> none = Maybe.none();
        
  Maybe<String> maybes = Maybe.accumulateJust(ListX.of(just, none, Maybe.of(1)), i -> "" + i,
                                                     Semigroups.stringConcat);
        //Maybe.of("101")
 
 
 

Parameters:

maybes - Maybes to accumulate

mapper - Mapping function to be applied to the result of each Maybe

reducer - Monoid to combine values from each Maybe

Returns:

Maybe with reduced value

accumulateJust

static <T> Maybe<T> accumulateJust(Monoid<T> reducer,
                                   CollectionX<Maybe<T>> maybes)

Accumulate the results only from those Maybes which have a value present, using the supplied Monoid (a combining BiFunction/BinaryOperator and identity element that takes two input values of the same type and returns the combined result) cyclops2.Monoids .

  
 
  Maybe<Integer> maybes = Maybe.accumulateJust(Monoids.intSum,ListX.of(just, none, Maybe.of(1)));
        //Maybe.of(11)
 
 
 

Parameters:

maybes - Maybes to accumulate

reducer - Monoid to combine values from each Maybe

Returns:

Maybe with reduced value

zipWith

default <R> Maybe<R> zipWith(java.lang.Iterable<java.util.function.Function<? super T,? extends R>> fn)

Specified by:

zipWith in interface Zippable<T>

zipWithS

default <R> Maybe<R> zipWithS(java.util.stream.Stream<java.util.function.Function<? super T,? extends R>> fn)

Specified by:

zipWithS in interface Zippable<T>

zipWithP

default <R> Maybe<R> zipWithP(org.reactivestreams.Publisher<java.util.function.Function<? super T,? extends R>> fn)

Specified by:

zipWithP in interface Zippable<T>

retry

default <R> Maybe<R> retry(java.util.function.Function<? super T,? extends R> fn)

Description copied from interface: Transformable

Retry a transformation if it fails. Default settings are to retry up to 7 times, with an doubling backoff period starting @ 2 seconds delay before retry.

 
 given(serviceMock.apply(anyInt())).willThrow(
 				new RuntimeException(new SocketException("First")),
 				new RuntimeException(new IOException("Second"))).willReturn(
 				"42");


 		String result = ReactiveSeq.of( 1,  2, 3)
 				.retry(serviceMock)
 				.firstValue();

 		//result = 42
 
 

Specified by:

retry in interface Transformable<T>

Parameters:

fn - Function to retry if fails

zipP

default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>> zipP(org.reactivestreams.Publisher<? extends U> other)

Specified by:

zipP in interface Zippable<T>

retry

default <R> Maybe<R> retry(java.util.function.Function<? super T,? extends R> fn,
                           int retries,
                           long delay,
                           java.util.concurrent.TimeUnit timeUnit)

Description copied from interface: Transformable

Retry a transformation if it fails. Retries up to retries times, with an doubling backoff period starting @ delay TimeUnits delay before retry.

 
 given(serviceMock.apply(anyInt())).willThrow(
 				new RuntimeException(new SocketException("First")),
 				new RuntimeException(new IOException("Second"))).willReturn(
 				"42");


 		String result = ReactiveSeq.of( 1,  2, 3)
 				.retry(serviceMock, 7, 2, TimeUnit.SECONDS)
 				.firstValue();

 		//result = 42
 
 

Specified by:

retry in interface Transformable<T>

Parameters:

fn - Function to retry if fails

retries - Number of retries

delay - Delay in TimeUnits

timeUnit - TimeUnit to use for delay

zip3

default <S,U> Maybe<org.jooq.lambda.tuple.Tuple3<T,S,U>> zip3(java.lang.Iterable<? extends S> second,
                                                              java.lang.Iterable<? extends U> third)

Description copied from interface: Zippable

zip 3 Streams into one

 
  List<Tuple3<Integer, Integer, Character>> list = of(1, 2, 3, 4, 5, 6).zip3(of(100, 200, 300, 400), of('a', 'b', 'c')).collect(Collectors.toList());

  // [[1,100,'a'],[2,200,'b'],[3,300,'c']]
 

 

Specified by:

zip3 in interface Zippable<T>

zip3

default <S,U,R> Maybe<R> zip3(java.lang.Iterable<? extends S> second,
                              java.lang.Iterable<? extends U> third,
                              Fn3<? super T,? super S,? super U,? extends R> fn3)

Specified by:

zip3 in interface Zippable<T>

zip4

default <T2,T3,T4> Maybe<org.jooq.lambda.tuple.Tuple4<T,T2,T3,T4>> zip4(java.lang.Iterable<? extends T2> second,
                                                                        java.lang.Iterable<? extends T3> third,
                                                                        java.lang.Iterable<? extends T4> fourth)

Description copied from interface: Zippable

zip 4 Streams into 1

 
  List<Tuple4<Integer, Integer, Character, String>> list = of(1, 2, 3, 4, 5, 6).zip4(of(100, 200, 300, 400), of('a', 'b', 'c'), of("hello", "world"))
          .collect(Collectors.toList());

 
 // [[1,100,'a',"hello"],[2,200,'b',"world"]]
 

Specified by:

zip4 in interface Zippable<T>

zip4

default <T2,T3,T4,R> Maybe<R> zip4(java.lang.Iterable<? extends T2> second,
                                   java.lang.Iterable<? extends T3> third,
                                   java.lang.Iterable<? extends T4> fourth,
                                   Fn4<? super T,? super T2,? super T3,? super T4,? extends R> fn)

Specified by:

zip4 in interface Zippable<T>

flatMapS

default <R> Maybe<R> flatMapS(java.util.function.Function<? super T,? extends java.util.stream.Stream<? extends R>> mapper)

Specified by:

flatMapS in interface MonadicValue<T>

forEach4

default <T2,R1,R2,R3,R> Maybe<R> forEach4(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                          java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2,
                                          Fn3<? super T,? super R1,? super R2,? extends MonadicValue<R3>> value3,
                                          Fn4<? super T,? super R1,? super R2,? super R3,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a four level nested internal iteration over this MonadicValue and the supplied MonadicValues

  
  Maybe.of(3)
       .forEach4(a->Maybe.just(a+10),
                 (a,b)->Maybe.just(a+b),
                 (a,b,c)->Maybe.none(),
                 (a,b,c,d)->a+b+c+d);
                                  
  
  //Maybe.none
 
 

Specified by:

forEach4 in interface MonadicValue<T>

Parameters:

value1 - Nested MonadicValue to iterate over

value2 - Nested MonadicValue to iterate over

value3 - Nested MonadicValue to iterate over

yieldingFunction - Function with pointers to the current element from both MonadicValue that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

forEach4

default <T2,R1,R2,R3,R> Maybe<R> forEach4(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                          java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2,
                                          Fn3<? super T,? super R1,? super R2,? extends MonadicValue<R3>> value3,
                                          Fn4<? super T,? super R1,? super R2,? super R3,java.lang.Boolean> filterFunction,
                                          Fn4<? super T,? super R1,? super R2,? super R3,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a four level nested internal iteration over this MonadicValue and the supplied MonadicValues Maybe.of(3) .forEach4(a->Maybe.just(a+10), (a,b)->Maybe.just(a+b), (a,b,c)->Maybe.none(), (a,b,c,d)->a+b+c<100, (a,b,c,d)->a+b+c+d); //Maybe.none

Specified by:

forEach4 in interface MonadicValue<T>

Parameters:

value1 - Nested MonadicValue to iterate over

value2 - Nested MonadicValue to iterate over

value3 - Nested MonadicValue to iterate over

filterFunction - Filter to apply over elements before passing non-filtered values to the yielding function

yieldingFunction - Function with pointers to the current element from both MonadicValue that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

forEach3

default <T2,R1,R2,R> Maybe<R> forEach3(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                       java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2,
                                       Fn3<? super T,? super R1,? super R2,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a three level nested internal iteration over this MonadicValue and the supplied MonadicValues

  
  Maybe.of(3)
       .forEach3(a->Maybe.just(a+10),
                 (a,b)->Maybe.just(a+b),
                 (a,b,c)->a+b+c<100,
                 (a,b,c)->a+b+c);
                                  
  
  //Maybe[32]
 
 

Specified by:

forEach3 in interface MonadicValue<T>

Parameters:

value1 - Nested MonadicValue to iterate over

value2 - Nested MonadicValue to iterate over

yieldingFunction - Function with pointers to the current element from both MonadicValue that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

forEach3

default <T2,R1,R2,R> Maybe<R> forEach3(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                       java.util.function.BiFunction<? super T,? super R1,? extends MonadicValue<R2>> value2,
                                       Fn3<? super T,? super R1,? super R2,java.lang.Boolean> filterFunction,
                                       Fn3<? super T,? super R1,? super R2,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a three level nested internal iteration over this MonadicValue and the supplied MonadicValues

  
  Maybe.of(3)
       .forEach3(a->Maybe.just(a+10),
                 (a,b)->Maybe.just(a+b),
                 (a,b,c)->a+b+c<100,
                 (a,b,c)->a+b+c);
                                  
  
  //Maybe[32]
 
 

Specified by:

forEach3 in interface MonadicValue<T>

Parameters:

value1 - Nested MonadicValue to iterate over

value2 - Nested MonadicValue to iterate over

filterFunction - Filter to apply over elements before passing non-filtered values to the yielding function

yieldingFunction - Function with pointers to the current element from both MonadicValue that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

forEach2

default <R1,R> Maybe<R> forEach2(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                 java.util.function.BiFunction<? super T,? super R1,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a two level nested internal iteration over this MonadicValue and the supplied MonadicValue

  
  Maybe.of(3)
       .forEach2(a->Maybe.none(),
                 (a,b)->a+b);
                                  
 
  //Maybe.none()
 
 

Specified by:

forEach2 in interface MonadicValue<T>

Parameters:

value1 - Nested Monadic Type to iterate over

yieldingFunction - Function with pointers to the current element from both monad types that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

forEach2

default <R1,R> Maybe<R> forEach2(java.util.function.Function<? super T,? extends MonadicValue<R1>> value1,
                                 java.util.function.BiFunction<? super T,? super R1,java.lang.Boolean> filterFunction,
                                 java.util.function.BiFunction<? super T,? super R1,? extends R> yieldingFunction)

Description copied from interface: MonadicValue

Perform a two level nested internal iteration over this MonadicValue and the supplied stream

  
  Maybe.of(3)
       .forEach2(a->Maybe.none(),
                 a->b-> a<3 && b>10,
                 (a,b)->a+b);
                                  
 
  //Maybe.none()
 
 

Specified by:

forEach2 in interface MonadicValue<T>

filterFunction - Filter to apply over elements before passing non-filtered values to the yielding function

yieldingFunction - Function with pointers to the current element from both Streams that generates the new elements

Returns:

MonadicValue with elements generated via nested iteration

combine

default <T2,R> Maybe<R> combine(Value<? extends T2> app,
                                java.util.function.BiFunction<? super T,? super T2,? extends R> fn)

Description copied from interface: MonadicValue

Lazily combine this ApplicativeFunctor with the supplied value via the supplied BiFunction Example

 
   Maybe<Integer> some = Maybe.just(10);
   just.combine(Eval.now(20), this::add);
   //Some[30]

   Maybe<Integer> none = Maybe.none();
   none.combine(Eval.now(20), this::add);
   //None

 
 

Specified by:

combine in interface MonadicValue<T>

Parameters:

app - Value to combine with this one.

fn - BiFunction to combine them

Returns:

New Applicativefunctor that represents the combined values

zip

default <T2,R> Maybe<R> zip(java.lang.Iterable<? extends T2> app,
                            java.util.function.BiFunction<? super T,? super T2,? extends R> fn)

Description copied from interface: Zippable

Zip (combine) this Zippable with the supplied Iterable using the supplied combining function

Specified by:

zip in interface MonadicValue<T>

Specified by:

zip in interface Zippable<T>

Parameters:

app - to zip with

fn - Zip function

Returns:

Combined zippable

zipP

default <T2,R> Maybe<R> zipP(org.reactivestreams.Publisher<? extends T2> app,
                             java.util.function.BiFunction<? super T,? super T2,? extends R> fn)

Description copied from interface: Zippable

Zip (combine) this Zippable with the supplied Publisher, using the supplied combining function

Specified by:

zipP in interface MonadicValue<T>

Specified by:

zipP in interface Zippable<T>

Parameters:

app - to combine with

fn - Zip / combining function

Returns:

Combined zippable

zip

default Maybe<T> zip(java.util.function.BinaryOperator<Zippable<T>> combiner,
                     Zippable<T> app)

Description copied from interface: Zippable

Combine two applicatives together using the provided BinaryOperator (Semigroup, Monoid and Reducer all extend BinaryOperator - checkout Semigroups and Monoids for a large number of canned combinations). If this Applicative is a scalar value the provided value is combined with that value, otherwise the value is combined pair wise with all value in a non-scalar datastructure

Specified by:

zip in interface Zippable<T>

Returns:

See Also:

Semigroup, Semigroups, Monoid, To lift any Semigroup (or monoid) up to handling Applicatives use the combineApplicatives operator in Semigroups {@see com.aol.cyclops2.Semigroups#combineApplicatives(BiFunction) } or Monoids { {@see com.aol.cyclops2.Monoids#combineApplicatives(java.util.function.Function, com.aol.cyclops2.function.Monoid) }

 {@code


  BinaryOperator> sumMaybes = Semigroups.combineScalarFunctors(Semigroups.intSum);
        Maybe.just(1).zip(sumMaybes, Maybe.just(5))
       //Maybe.just(6));
 }
 

zipS

default <U,R> Maybe<R> zipS(java.util.stream.Stream<? extends U> other,
                            java.util.function.BiFunction<? super T,? super U,? extends R> zipper)

Description copied from interface: Zippable

Zip (combine) this Zippable with the supplied Stream, using the supplied combining function

Specified by:

zipS in interface Zippable<T>

Parameters:

other - Stream to combine with

zipper - Zip / combining function

Returns:

Combined zippable

zipS

default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>> zipS(java.util.stream.Stream<? extends U> other)

Description copied from interface: Zippable

Zip (combine) this Zippable with the supplied Stream combining both into a Tuple2

Specified by:

zipS in interface Zippable<T>

Parameters:

other - Stream to combine with

Returns:

Combined Zippable

zip

default <U> Maybe<org.jooq.lambda.tuple.Tuple2<T,U>> zip(java.lang.Iterable<? extends U> other)

Description copied from interface: Zippable

Zip (combine) this Zippable with the supplied Iterable combining both into a Tuple2

Specified by:

zip in interface Zippable<T>

Parameters:

other - Iterable to combine with

Returns:

unit

default <T> Maybe<T> unit(T unit)

Specified by:

unit in interface MonadicValue<T>

Specified by:

unit in interface Unit<T>

coflatMap

default <R> Maybe<R> coflatMap(java.util.function.Function<? super MonadicValue<T>,R> mapper)

Description copied from interface: MonadicValue

Perform a coflatMap operation. The mapping function accepts this MonadicValue and returns a single value to be wrapped inside a Monad.

  
   Maybe.none().coflatMap(m -> m.isPresent() ? m.get() : 10);
   //Maybe[10]
 
 

Specified by:

coflatMap in interface MonadicValue<T>

Parameters:

mapper - Mapping / transformation function

Returns:

MonadicValue wrapping return value from transformation function applied to the value inside this MonadicValue

nest

default Maybe<MonadicValue<T>> nest()

Description copied from interface: MonadicValue

cojoin pattern. Nests this Monad inside another.

Specified by:

nest in interface MonadicValue<T>

Returns:

Nested Monad

combineEager

default Maybe<T> combineEager(Monoid<T> monoid,
                              MonadicValue<? extends T> v2)

Description copied from interface: MonadicValue

Eagerly combine two MonadicValues using the supplied monoid (@see ApplicativeFunctor for type appropraite i.e. lazy / async alternatives)

  
 
  Monoid<Integer> add = Monoid.of(1,Semigroups.intSum);
  Maybe.of(10).combineEager(add,Maybe.none());
  //Maybe[10]
  
  Maybe.none().combineEager(add,Maybe.of(10));
  //Maybe[10]
  
  Maybe.none().combineEager(add,Maybe.none());
  //Maybe.none()
  
  Maybe.of(10).combineEager(add,Maybe.of(10));
  //Maybe[20]
  
  Monoid<Integer> firstNonNull = Monoid.of(null , Semigroups.firstNonNull());
  Maybe.of(10).combineEager(firstNonNull,Maybe.of(10));
  //Maybe[10]
 

Specified by:

combineEager in interface MonadicValue<T>

Returns:

toMaybe

default Maybe<T> toMaybe()

Description copied from interface: Value

Returns a function result or a supplier result. The first one if the function isn't null and the second one if it is.

Specified by:

toMaybe in interface Value<T>

Returns:

new Maybe with the result of a function or supplier.

isPresent

boolean isPresent()

Specified by:

isPresent in interface Convertable<T>

Returns:

True if value exists and is non-null

recover

Maybe<T> recover(java.util.function.Supplier<T> value)

recover

Maybe<T> recover(T value)

recoverWith

Maybe<T> recoverWith(java.util.function.Supplier<? extends Maybe<T>> fn)

map

<R> Maybe<R> map(java.util.function.Function<? super T,? extends R> mapper)

Description copied from interface: Transformable

Transform this functor using the supplied transformation function

  
  
  
    of(1,2,3).map(i->i*2)
    
    //[2,4,6]
  
 
 

Specified by:

map in interface MonadicValue<T>

Specified by:

map in interface Transformable<T>

Parameters:

mapper - Transformation function

Returns:

Transformed Transformable

flatMap

<R> Maybe<R> flatMap(java.util.function.Function<? super T,? extends MonadicValue<? extends R>> mapper)

Description copied from interface: MonadicValue

A flattening transformation operation (@see Optional.flatMap(Function)

  
   Eval.now(1).map(i->i+2).flatMap(i->Eval.later(()->i*3);
   //Eval[9]
 
 

Specified by:

flatMap in interface MonadicValue<T>

Parameters:

mapper - transformation function

Returns:

MonadicValue

visit

<R> R visit(java.util.function.Function<? super T,? extends R> some,
            java.util.function.Supplier<? extends R> none)

Description copied from interface: Visitable

The provided function is executed with the value stored in this Visitable if one is present, otherwise the provided Supplier is executed instead.

Specified by:

visit in interface Convertable<T>

Specified by:

visit in interface Visitable<T>

Parameters:

some - Function to execute if this Visitable has a value

none - Supplier to execute if this Visitable does not have a Value

Returns:

Result of the executed Function or Supplier

filter

Maybe<T> filter(java.util.function.Predicate<? super T> fn)

Description copied from interface: Filters

Keep only elements for which the supplied predicates hold e.g.

  
   
     of(1,2,3).filter(i->i>2);
     
     //[3]
   
 
 

Specified by:

filter in interface Filters<T>

Specified by:

filter in interface MonadicValue<T>

Parameters:

fn - to filter elements by, retaining matches

Returns:

Filters with elements removed where the predicate does not hold

ofType

default <U> Maybe<U> ofType(java.lang.Class<? extends U> type)

Description copied from interface: Filters

Keep only those elements in a stream that are of a given type.

  
 
 // (1, 2, 3) ReactiveSeq.of(1, "a", 2, "b",3).ofType(Integer.class)
 
 
 

Specified by:

ofType in interface Filters<T>

filterNot

default Maybe<T> filterNot(java.util.function.Predicate<? super T> fn)

Description copied from interface: Filters

Remove any elements for which the predicate holds (inverse operation to filter) e.g.

  
   
     of(1,2,3).filter(i->i>2);
     
     //[1,2]
   
 
 

Specified by:

filterNot in interface Filters<T>

Parameters:

fn - to filter elements by, retaining matches

Returns:

Filters with elements removed where the predicate does not hold

notNull

default Maybe<T> notNull()

Description copied from interface: Filters

Filter elements retaining only values which are not null

  
 
   of(1,2,null,4).nonNull();
 
   //[1,2,4]
   
 
 

Specified by:

notNull in interface Filters<T>

Returns:

Filters with nulls removed

cast

default <U> Maybe<U> cast(java.lang.Class<? extends U> type)

Description copied from interface: Transformable

Cast all elements in a stream to a given type, possibly throwing a ClassCastException. // ClassCastException ReactiveSeq.of(1, "a", 2, "b", 3).cast(Integer.class)

Specified by:

cast in interface Transformable<T>

peek

default Maybe<T> peek(java.util.function.Consumer<? super T> c)

Description copied from interface: Transformable

Peek at the current value of this Transformable, without transforming it

  
  
  
    of(1,2,3).map(System.out::println)
    
    1
    2
    3
  
 
 

Specified by:

peek in interface Transformable<T>

Parameters:

c - Consumer that recieves each element from this Transformable

Returns:

Transformable that will peek at each value

trampoline

default <R> Maybe<R> trampoline(java.util.function.Function<? super T,? extends Trampoline<? extends R>> mapper)

Description copied from interface: Transformable

Performs a map operation that can call a recursive method without running out of stack space

 
 ReactiveSeq.of(10,20,30,40)
    			 .trampoline(i-> fibonacci(i))
    			 .forEach(System.out::println); 
    			 
    	Trampoline<Long> fibonacci(int i){
    		return fibonacci(i,1,0);
    	}
    	Trampoline<Long> fibonacci(int n, long a, long b) {
        	return n == 0 ? Trampoline.done(b) : Trampoline.more( ()->fibonacci(n-1, a+b, a));
    	}		 
    			 
 55
    	6765
    	832040
    	102334155
 
 
 ReactiveSeq.of(10_000,200_000,3_000_000,40_000_000)
    			 .trampoline(i-> fibonacci(i))
    			 .forEach(System.out::println);
    			 
    			 
 completes successfully
 
 

Specified by:

trampoline in interface Transformable<T>

Parameters:

mapper - TCO Transformation function

Returns:

Transformable transformed by the supplied transformation function