Option.None (cyclops 10.1.0 API)

java.lang.Object
- cyclops.control.Option.None<T>

All Implemented Interfaces:

Convert<Higher<DataWitness.option,T>>, Higher<DataWitness.option,T>, Sealed2<T,Option.None<T>>, SealedOr<T>, EmptyUnit<T>, Unit<T>, Filters<T>, To<Option<T>>, Transformable<T>, MonadicValue<T>, OrElseValue<T,Option<T>>, Recoverable<T>, Value<T>, Zippable<T>, Option<T>, io.kindedj.Hk<DataWitness.option,T>, java.io.Serializable, java.lang.Iterable<T>, org.reactivestreams.Publisher<T>

Enclosing interface:

Option<T>
```
public static class Option.None<T>
extends java.lang.Object
implements Option<T>
```
See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface cyclops.control.Option
  Option.Comprehensions, Option.None<T>, Option.Some<T>

Field Summary

Fields
Modifier and Type Field and Description

static Option.None NOTHING_EAGER
- Fields inherited from interface cyclops.control.Option
  EMPTY

Fields
Modifier and Type	Field and Description
`static Option.None`	`NOTHING_EAGER`

Constructor Summary

Constructors
Constructor and Description

None()

Constructors
Constructor and Description
`None()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`<R> Option.None<R>`	`concatMap(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.
`boolean`	`equals(java.lang.Object obj)`
`Option<T>`	`filter(java.util.function.Predicate<? super T> test)` Keep only elements for which the supplied predicates hold e.g.
`<R> Option<R>`	`flatMap(java.util.function.Function<? super T,? extends MonadicValue<? extends R>> mapper)` A flattening transformation operation (@see `Optional.flatMap(Function)`
`<R> R`	`fold(java.util.function.Function<? super T,? extends R> fn1, java.util.function.Function<? super Option.None<T>,? extends R> fn2)`
`<R> R`	`fold(java.util.function.Function<? super T,? extends R> some, java.util.function.Supplier<? extends R> none)`
`void`	`forEach(java.util.function.Consumer<? super T> action)`
`boolean`	`isPresent()`
`<R> Option<R>`	`map(java.util.function.Function<? super T,? extends R> mapper)` Transform this functor using the supplied transformation function
`<R> Option.None<R>`	`mergeMap(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.
`T`	`orElse(T value)`
`T`	`orElseGet(java.util.function.Supplier<? extends T> value)`
`Option<T>`	`recover(java.util.function.Supplier<? extends T> value)`
`Option<T>`	`recover(T value)`
`Option<T>`	`recoverWith(java.util.function.Supplier<? extends Option<T>> fn)`
`java.util.Optional<T>`	`toOptional()`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface cyclops.control.Option
accumulateJust, accumulateJust, accumulateJust, attempt, attemptFlatMap, eager, emptyUnit, filterNot, forEach2, forEach2, forEach3, forEach3, forEach4, forEach4, fromFuture, fromIterable, fromNullable, fromOptional, fromPublisher, fromStream, lazy, narrow, narrowK, none, notNull, of, ofNullable, ofType, orElseUse, peek, sequence, sequence, sequence, sequenceJust, some, tailRec, toMaybe, toTrampoline, traverse, unit, widen, widen2, zip, zip, zip, zip3, zip3, zip4, zip4, zipWithPublisher

Methods inherited from interface com.oath.cyclops.types.foldable.To
to

Methods inherited from interface com.oath.cyclops.types.OrElseValue
orElseUse

Methods inherited from interface com.oath.cyclops.types.MonadicValue
arity, attemptMap, mapAsync, mapRetry, mapRetry, mapTry, mapTry

Methods inherited from interface com.oath.cyclops.types.Value
asSupplier, collect, fold, generate, iterate, iterator, mkString, nonEmptyList, nonEmptyListGet, print, print, printErr, printOut, stream, subscribe, toEither, toLazyEither, toLeft, toOption, toRight, toTry, toTry, toTry

Methods inherited from interface java.lang.Iterable
spliterator

Methods inherited from interface com.oath.cyclops.hkt.Higher
applyHKT_, applyHKT, applyHKT

Methods inherited from interface com.oath.cyclops.hkt.Convert
convert

- Field Detail
  - NOTHING_EAGER
```
public static Option.None NOTHING_EAGER
```
- Constructor Detail
  - None
```
public None()
```
- Method Detail
  - map
```
public <R> Option<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 Transformable<T>
    
    Specified by:
    
    map in interface MonadicValue<T>
    
    Specified by:
    
    map in interface Option<T>
    
    Parameters:
    
    mapper - Transformation function
    
    Returns:
    
    Transformed Transformable
  - flatMap
```
public <R> Option<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>
    
    Specified by:
    
    flatMap in interface Option<T>
    
    Parameters:
    
    mapper - transformation function
    
    Returns:
    
    MonadicValue
  - filter
```
public Option<T> filter(java.util.function.Predicate<? super T> test)
```
    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>
    
    Specified by:
    
    filter in interface Option<T>
    
    Parameters:
    
    test - to filter elements by, retaining matches
    
    Returns:
    
    Filters with elements removed where the predicate does not hold
  - recover
```
public Option<T> recover(T value)
```
    Specified by:
    
    recover in interface Option<T>
  - recover
```
public Option<T> recover(java.util.function.Supplier<? extends T> value)
```
    Specified by:
    
    recover in interface Recoverable<T>
    
    Specified by:
    
    recover in interface Option<T>
  - recoverWith
```
public Option<T> recoverWith(java.util.function.Supplier<? extends Option<T>> fn)
```
    Specified by:
    
    recoverWith in interface Option<T>
  - fold
```
public <R> R fold(java.util.function.Function<? super T,? extends R> some,
                  java.util.function.Supplier<? extends R> none)
```
    Specified by:
    
    fold in interface SealedOr<T>
    
    Specified by:
    
    fold in interface Option<T>
  - toOptional
```
public java.util.Optional<T> toOptional()
```
    Specified by:
    
    toOptional in interface Value<T>
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - isPresent
```
public boolean isPresent()
```
    Specified by:
    
    isPresent in interface Value<T>
    
    Specified by:
    
    isPresent in interface Option<T>
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object
  - orElse
```
public T orElse(T value)
```
    Specified by:
    
    orElse in interface Value<T>
  - orElseGet
```
public T orElseGet(java.util.function.Supplier<? extends T> value)
```
    Specified by:
    
    orElseGet in interface Value<T>
  - concatMap
```
public <R> Option.None<R> concatMap(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).concatMap(i->Arrays.asList(()->i*3,20);
   //Maybe[9]

 
```
    Specified by:
    
    concatMap in interface MonadicValue<T>
    
    Specified by:
    
    concatMap in interface Option<T>
    
    Parameters:
    
    mapper - transformation function
    
    Returns:
    
    MonadicValue
  - mergeMap
```
public <R> Option.None<R> mergeMap(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.
```
 
   Future.ofResult(1).map(i->i+2).mergeMap(i->Flux.just(()->i*3,20);
   //Future[9]

 
```
    Specified by:
    
    mergeMap in interface MonadicValue<T>
    
    Specified by:
    
    mergeMap in interface Option<T>
    
    Parameters:
    
    mapper - transformation function
    
    Returns:
    
    MonadicValue
  - forEach
```
public void forEach(java.util.function.Consumer<? super T> action)
```
    Specified by:
    
    forEach in interface Value<T>
    
    Specified by:
    
    forEach in interface java.lang.Iterable<T>
  - fold
```
public <R> R fold(java.util.function.Function<? super T,? extends R> fn1,
                  java.util.function.Function<? super Option.None<T>,? extends R> fn2)
```
    Specified by:
    
    fold in interface Sealed2<T,Option.None<T>>

Class Option.None<T>

Nested Class Summary

Nested classes/interfaces inherited from interface cyclops.control.Option

Field Summary

Fields inherited from interface cyclops.control.Option

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface cyclops.control.Option

Methods inherited from interface com.oath.cyclops.types.foldable.To

Methods inherited from interface com.oath.cyclops.types.OrElseValue

Methods inherited from interface com.oath.cyclops.types.MonadicValue

Methods inherited from interface com.oath.cyclops.types.Value

Methods inherited from interface java.lang.Iterable

Methods inherited from interface com.oath.cyclops.hkt.Higher

Methods inherited from interface com.oath.cyclops.hkt.Convert

Field Detail

NOTHING_EAGER

Constructor Detail

None

Method Detail

map

flatMap

filter

recover

recover

recoverWith

fold

toOptional

toString

isPresent

equals

orElse

orElseGet

concatMap

mergeMap

forEach

fold