Package io.vavr

Interface Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>

Type Parameters:

T1 - argument 1 of the function

T2 - argument 2 of the function

T3 - argument 3 of the function

T4 - argument 4 of the function

T5 - argument 5 of the function

T6 - argument 6 of the function

T7 - argument 7 of the function

T8 - argument 8 of the function

R - return type of the function

All Superinterfaces:

java.io.Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>
extends java.io.Serializable

Represents a function with 8 arguments.

Field Summary

Fields

Modifier and Type	Field	Description
static long	serialVersionUID	The serial version uid.

Method Summary

Modifier and Type	Method	Description
default <V> Function8<T1,T2,T3,T4,T5,T6,T7,T8,V>	andThen(java.util.function.Function<? super R,? extends V> after)	Returns a composed function that first applies this Function8 to the given argument and then applies Function after to the result.
default Function7<T2,T3,T4,T5,T6,T7,T8,R>	apply(T1 t1)	Applies this function partially to one argument.
default Function6<T3,T4,T5,T6,T7,T8,R>	apply(T1 t1, T2 t2)	Applies this function partially to two arguments.
default Function5<T4,T5,T6,T7,T8,R>	apply(T1 t1, T2 t2, T3 t3)	Applies this function partially to three arguments.
default Function4<T5,T6,T7,T8,R>	apply(T1 t1, T2 t2, T3 t3, T4 t4)	Applies this function partially to 4 arguments.
default Function3<T6,T7,T8,R>	apply(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5)	Applies this function partially to 5 arguments.
default Function2<T7,T8,R>	apply(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6)	Applies this function partially to 6 arguments.
default Function1<T8,R>	apply(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7)	Applies this function partially to 7 arguments.
R	apply(T1 t1, T2 t2, T3 t3, T4 t4, T5 t5, T6 t6, T7 t7, T8 t8)	Applies this function to 8 arguments and returns the result.
default int	arity()	Returns the number of function arguments.
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>	constant(R value)	Returns a function that always returns the constant value that you give in parameter.
default Function1<T1,Function1<T2,Function1<T3,Function1<T4,Function1<T5,Function1<T6,Function1<T7,Function1<T8,R>>>>>>>>	curried()	Returns a curried version of this function.
default boolean	isMemoized()	Checks if this function is memoizing (= caching) computed values.
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,Option<R>>	lift(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> partialFunction)	Lifts the given partialFunction into a total function that returns an Option result.
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,Try<R>>	liftTry(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> partialFunction)	Lifts the given partialFunction into a total function that returns an Try result.
default Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>	memoized()	Returns a memoizing version of this function, which computes the return value for given arguments only one time.
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>	narrow(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> f)	Narrows the given Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> to Function8<T1, T2, T3, T4, T5, T6, T7, T8, R>
static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R>	of(Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> methodReference)	Creates a Function8 based on method reference lambda expression Examples (w.l.o.g.
default Function8<T8,T7,T6,T5,T4,T3,T2,T1,R>	reversed()	Returns a reversed version of this function.
default Function1<Tuple8<T1,T2,T3,T4,T5,T6,T7,T8>,R>	tupled()	Returns a tupled version of this function.

Field Detail

serialVersionUID

static final long serialVersionUID

The serial version uid.

See Also:

Constant Field Values

Method Detail

constant

static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> constant(R value)

Returns a function that always returns the constant value that you give in parameter.

Type Parameters:

T1 - generic parameter type 1 of the resulting function

T2 - generic parameter type 2 of the resulting function

T3 - generic parameter type 3 of the resulting function

T4 - generic parameter type 4 of the resulting function

T5 - generic parameter type 5 of the resulting function

T6 - generic parameter type 6 of the resulting function

T7 - generic parameter type 7 of the resulting function

T8 - generic parameter type 8 of the resulting function

R - the result type

Parameters:

value - the value to be returned

Returns:

a function always returning the given value

of

static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> of(Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> methodReference)

Creates a Function8 based on

• method reference
• lambda expression

Examples (w.l.o.g. referring to Function1):

// using a lambda expression
 Function1<Integer, Integer> add1 = Function1.of(i -> i + 1);

 // using a method reference (, e.g. Integer method(Integer i) { return i + 1; })
 Function1<Integer, Integer> add2 = Function1.of(this::method);

 // using a lambda reference
 Function1<Integer, Integer> add3 = Function1.of(add1::apply);
 

Caution: Reflection loses type information of lambda references.

// type of a lambda expression
 Type<?, ?> type1 = add1.getType(); // (Integer) -> Integer

 // type of a method reference
 Type<?, ?> type2 = add2.getType(); // (Integer) -> Integer

 // type of a lambda reference
 Type<?, ?> type3 = add3.getType(); // (Object) -> Object
 

Type Parameters:

R - return type

T1 - 1st argument

T2 - 2nd argument

T3 - 3rd argument

T4 - 4th argument

T5 - 5th argument

T6 - 6th argument

T7 - 7th argument

T8 - 8th argument

Parameters:

methodReference - (typically) a method reference, e.g. Type::method

Returns:

a Function8

lift

static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,Option<R>> lift(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> partialFunction)

Lifts the given partialFunction into a total function that returns an Option result.

Type Parameters:

R - return type

T1 - 1st argument

T2 - 2nd argument

T3 - 3rd argument

T4 - 4th argument

T5 - 5th argument

T6 - 6th argument

T7 - 7th argument

T8 - 8th argument

Parameters:

partialFunction - a function that is not defined for all values of the domain (e.g. by throwing)

Returns:

a function that applies arguments to the given partialFunction and returns Some(result) if the function is defined for the given arguments, and None otherwise.

liftTry

static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,Try<R>> liftTry(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> partialFunction)

Lifts the given partialFunction into a total function that returns an Try result.

Type Parameters:

R - return type

T1 - 1st argument

T2 - 2nd argument

T3 - 3rd argument

T4 - 4th argument

T5 - 5th argument

T6 - 6th argument

T7 - 7th argument

T8 - 8th argument

Parameters:

partialFunction - a function that is not defined for all values of the domain (e.g. by throwing)

Returns:

a function that applies arguments to the given partialFunction and returns Success(result) if the function is defined for the given arguments, and Failure(throwable) otherwise.

narrow

static <T1,T2,T3,T4,T5,T6,T7,T8,R> Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> narrow(Function8<? super T1,? super T2,? super T3,? super T4,? super T5,? super T6,? super T7,? super T8,? extends R> f)

Narrows the given Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> to Function8<T1, T2, T3, T4, T5, T6, T7, T8, R>

Type Parameters:

R - return type

T1 - 1st argument

T2 - 2nd argument

T3 - 3rd argument

T4 - 4th argument

T5 - 5th argument

T6 - 6th argument

T7 - 7th argument

T8 - 8th argument

Parameters:

f - A Function8

Returns:

the given f instance as narrowed type Function8<T1, T2, T3, T4, T5, T6, T7, T8, R>

apply

R apply(T1 t1,
        T2 t2,
        T3 t3,
        T4 t4,
        T5 t5,
        T6 t6,
        T7 t7,
        T8 t8)

Applies this function to 8 arguments and returns the result.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

t4 - argument 4

t5 - argument 5

t6 - argument 6

t7 - argument 7

t8 - argument 8

Returns:

the result of function application

apply

default Function7<T2,T3,T4,T5,T6,T7,T8,R> apply(T1 t1)

Applies this function partially to one argument.

Parameters:

t1 - argument 1

Returns:

a partial application of this function

apply

default Function6<T3,T4,T5,T6,T7,T8,R> apply(T1 t1,
                                                                                 T2 t2)

Applies this function partially to two arguments.

Parameters:

t1 - argument 1

t2 - argument 2

Returns:

a partial application of this function

apply

default Function5<T4,T5,T6,T7,T8,R> apply(T1 t1,
                                                                        T2 t2,
                                                                        T3 t3)

Applies this function partially to three arguments.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

Returns:

a partial application of this function

apply

default Function4<T5,T6,T7,T8,R> apply(T1 t1,
                                                               T2 t2,
                                                               T3 t3,
                                                               T4 t4)

Applies this function partially to 4 arguments.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

t4 - argument 4

Returns:

a partial application of this function

apply

default Function3<T6,T7,T8,R> apply(T1 t1,
                                                      T2 t2,
                                                      T3 t3,
                                                      T4 t4,
                                                      T5 t5)

Applies this function partially to 5 arguments.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

t4 - argument 4

t5 - argument 5

Returns:

a partial application of this function

apply

default Function2<T7,T8,R> apply(T1 t1,
                                             T2 t2,
                                             T3 t3,
                                             T4 t4,
                                             T5 t5,
                                             T6 t6)

Applies this function partially to 6 arguments.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

t4 - argument 4

t5 - argument 5

t6 - argument 6

Returns:

a partial application of this function

apply

default Function1<T8,R> apply(T1 t1,
                                    T2 t2,
                                    T3 t3,
                                    T4 t4,
                                    T5 t5,
                                    T6 t6,
                                    T7 t7)

Applies this function partially to 7 arguments.

Parameters:

t1 - argument 1

t2 - argument 2

t3 - argument 3

t4 - argument 4

t5 - argument 5

t6 - argument 6

t7 - argument 7

Returns:

a partial application of this function

arity

default int arity()

Returns the number of function arguments.

Returns:

an int value >= 0

See Also:

Arity

curried

default Function1<T1,Function1<T2,Function1<T3,Function1<T4,Function1<T5,Function1<T6,Function1<T7,Function1<T8,R>>>>>>>> curried()

Returns a curried version of this function.

Returns:

a curried function equivalent to this.

tupled

default Function1<Tuple8<T1,T2,T3,T4,T5,T6,T7,T8>,R> tupled()

Returns a tupled version of this function.

Returns:

a tupled function equivalent to this.

reversed

default Function8<T8,T7,T6,T5,T4,T3,T2,T1,R> reversed()

Returns a reversed version of this function. This may be useful in a recursive context.

Returns:

a reversed function equivalent to this.

memoized

default Function8<T1,T2,T3,T4,T5,T6,T7,T8,R> memoized()

Returns a memoizing version of this function, which computes the return value for given arguments only one time. On subsequent calls given the same arguments the memoized value is returned.

Please note that memoizing functions do not permit null as single argument or return value.

Returns:

a memoizing function equivalent to this.

isMemoized

default boolean isMemoized()

Checks if this function is memoizing (= caching) computed values.

Returns:

true, if this function is memoizing, false otherwise

andThen

default <V> Function8<T1,T2,T3,T4,T5,T6,T7,T8,V> andThen(java.util.function.Function<? super R,? extends V> after)

Returns a composed function that first applies this Function8 to the given argument and then applies Function after to the result.

Type Parameters:

V - return type of after

Parameters:

after - the function applied after this

Returns:

a function composed of this and after

Throws:

java.lang.NullPointerException - if after is null