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Functional Programming in JAVA 8

Ignasi Marimon-Clos i Sunyol
Ignasi Marimon-Clos i Sunyol

Java 8 supports lambdas. It's API also comes with Streams support. But Knowing some concepts on Functional Programming may help you get a lot more from what this new version of Java has to offer.

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FP in JAVA 8 sponsored by ! Ignasi Marimon-Clos (@ignasi35) JUG Barcelona
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@ignasi35 thanks!
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@ignasi35 about you
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@ignasi35 about me @ignasi35 1) problem solver, Garbage Collector, mostly scala, java 8, agile for tech teams 2) kayaker 3) under construction 4) all things JVM
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@ignasi35 FP in Java 8 Pure Functions no side effects if not used, remove it fixed in — fixed out
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@ignasi35 FP in Java 8 (T, R) -> Q
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@ignasi35 FP in Java 8 Supplier<T> Function<T,R> BiFunction<T,R,Q> Predicate<T> Consumer<T> () -> T (T) -> R (T, R) -> Q (T) -> boolean (T) -> {}
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@ignasi35 currying (T, R) -> (Q) -> (S) -> J BiArgumentedPrototipicalFactoryFactoryBean
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@ignasi35
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@ignasi35 thanks!
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@ignasi35 End of presentation
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@ignasi35 XXIst Century DateTime
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@ignasi35 XXIst Century DateTime • Date is DEAD (my opinion) • Calendar is DEAD (my opinion) ! ! • DEAD is 57005 (that’s a fact)
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@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime ! • Enum.Month • Enum.DayOfWeek
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@ignasi35 XXIst Century DateTime Enum.Month ! • Not just JAN, FEB, MAR • Full arithmetic • plus(long months) • firstDayOfYear(boolean leapYear) • length(boolean leapYear) • …
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@ignasi35 XXIst Century DateTime • Clock • replace your sys.currentTimeMillis • allows testing • Instant/now • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime
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@ignasi35
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@ignasi35 XXIst Century DateTime • Clock • LocalDate • a date • no TimeZone • birth date, end of war, man on moon,… • LocalDateTime • Duration vs Period • ZonedDateTime
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@ignasi35
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@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • an hour of the day • noon • 9am • Duration vs Period • ZonedDateTime
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@ignasi35
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@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • Duration: 365*24*60*60*1000 • Period: 1 year (not exactly 365 days) • Duration (Time) vs Period (Date) • ZonedDateTime
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@ignasi35
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@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime (not an Instant!!) • Immutable • nanosecond detail • Normal, Gap, Overlap
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@ignasi35 Lists a1 1 2 3 Nil List<Integer> nil = Lists.nil(); ! List<Integer> a3 = nil.prepend(3); List<Integer> a2 = a3.prepend(2); List<Integer> a1 = a2.prepend(1);
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@ignasi35 Lists a1 1 2 3 Nil head(); tail();
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@ignasi35 public interface List<T> { T head(); List<T> tail(); boolean isEmpty(); void forEach(Consumer<? super T> f); default List<T> prepend(T t) { return new Cons<>(t, this); } } Lists
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@ignasi35 Lists a1 1 2 3 Nil 0 a0 b Cons Cons Cons Cons 4 Cons List<Integer> a0 = a1.prepend(0); List<Integer> b = a1.prepend(4);
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@ignasi35 class Cons<T> implements List<T> { private T head; private List<T> tail; Const(T head, List<T> tail) { this.head = head; this.tail = tail; } ! T head(){return this.head;} List<T> tail(){return this.tail;} boolean isEmpty(){return false;} ! void forEach(Consumer<? super T> f){ f.accept(head); tail.forEach(f); } } Lists
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@ignasi35 class Nil<T> implements List<T> { ! T head() { throw new NoSuchElementException(); } List<T> tail() { throw new NoSuchElementException(); } boolean isEmpty() { return true; } void forEach(Consumer<? super T> f){ } ! } Lists
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@ignasi35 Lists a1 1 2 3 Nil 0 a0 b Cons Cons Cons Cons 4 Cons Persistent Datastructures (not ephemeral, versioning) Immutable As efficient (consider amortised cost)
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@ignasi35
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@ignasi35 filter class Nil<T> implements List<T> { //… List<T> filter(Predicate<? super T> p) { return this; } } ! class Cons<T> implements List<T> { //… List<T> filter(Predicate<? super T> p) { if (p.test(head)) return new Const<>(head, tail.filter(p)); else return tail.filter(p); } }
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@ignasi35 map
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@ignasi35 map f
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@ignasi35 map class Nil<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return (List<R>) this; } } ! class Cons<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return new Const<>(f.apply(head), tail.map(f)); } }
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@ignasi35
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@ignasi35 fold f f f
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@ignasi35 fold class Nil<T> implements List<T> { <Z> Z reduce(Z z, BiFunction<Z, T, Z> f) { return z; } } ! class Cons<T> implements List<T> { <Z> Z reduce(Z z, BiFunction<Z, T, Z> f) { return tail.reduce(f.apply(z,head), f); } }
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@ignasi35 fold aka reduce
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@ignasi35 map revisited f
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@ignasi35 map revisited f
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! @Test void testMapList() { List<List<String>> actual = Lists @ignasi35 .of(“hello world”, “This is sparta”, “asdf asdf”) .map(s -> Lists.of(s.split(“ ”))); ! List<String> expected = Lists.of(“hello”, “world”, “This”, “is”, “sparta”, “asdf”, “asdf”); ! assertEquals(expected, actual); } map revisited
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@ignasi35
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@ignasi35
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@ignasi35
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@ignasi35 map f
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@ignasi35 flatMap f
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@ignasi35 flatMap ! class Cons<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return new Const<>(f.apply(head), tail.map(f)); } ! <R> List<R> flatMap(Function<T, List<R> f) { return f.apply(head).append(tail.flatMap(f)); } ! }
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@ignasi35
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@ignasi35 recap filter ! map ! fold ! flatMap
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@ignasi35
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@ignasi35 class MyFoo { ! //@param surname may be null Person someFunc(String name, String surname) { … } ! }
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@ignasi35 Maybe (aka Optional) replaces null completely
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@ignasi35 Maybe (aka Optional) replaces null completely forever
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@ignasi35 Maybe (aka Optional) replaces null completely forever and ever
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@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever
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@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever
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@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever and ever
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@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever and ever and ever
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@ignasi35 Maybe (aka Optional) ! class MyFoo { Person someFunc(String name, Optional<String> surname) { … } ! … ! }
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@ignasi35 Maybe (aka Optional) ! class MyFoo { Optional<Person> someFunc(Name x, Optional<Surname> y) { … } ! … ! }
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@ignasi35 Maybe (aka Optional) Some/Just/Algo ! ! None/Nothing/Nada ADT
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@ignasi35
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@ignasi35 Maybe (aka Optional) filter: applies predicate and Returns input or None map: converts content fold: returns Some(content) or Some(default) flatMap: see list get: returns content or throws Exception getOrElse: returns content or defaultValue
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@ignasi35 recap filter ! map ! fold ! flatMap ADT ! Functor
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@ignasi35
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@ignasi35
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@ignasi35 Future (aka CompletableFuture)
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@ignasi35 Future (aka CF, aka CompletableFuture) ! [FAIL] Does not use map, flatMap, filter. ! [PASS] CF implemented ADT ! [FAIL] Because Supplier, Consumer, Function, Bifuction, … CF’s API sucks.
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@ignasi35 Future filter: creates new future applying Predicate map: converts content if success. New Future fold: n/a flatMap: see list andThen: chains this Future’s content into a Consumer onSuccess/onFailure: callbacks recover: equivalent to map() but applied only on Fail
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@ignasi35 recap filter ! map ! fold ! flatMap ! andThen ADT ! Functor
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@ignasi35 recap ! Maybe simulates nullable Future will eventually happen ! Exceptions still fuck up your day
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@ignasi35
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@ignasi35
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@ignasi35 Try Simulates a computation that: ! succeeded or threw exception
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@ignasi35
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@ignasi35 Try in action
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@ignasi35 Try in action
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@ignasi35 Try in action
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@ignasi35 ! class PersonRepository { Try<Person> loadBy(Name x, Optional<Surname> y) { … } ! … ! } Conclusions
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@ignasi35 class SafeDatabase { <T> T withTransaction(Function<Connection, T> block) { … } } ! class AnyAOP { <T> T envolve(Supplier<T> block) { … } } Conclusions
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@ignasi35
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@ignasi35
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@ignasi35 Moar resources https://github.com/rocketscience-projects/javaslang by https://twitter.com/danieldietrich thanks @thomasdarimont for the tip ! https://github.com/functionaljava/functionaljava by http://www.functionaljava.org/ (runs in Java7)
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@ignasi35
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@ignasi35
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@ignasi35 Namaste
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@ignasi35 Questions
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@ignasi35 End of presentation
FP in JAVA 8 sponsored by ! Ignasi Marimon-Clos (@ignasi35) JUG Barcelona
@ignasi35 thanks!
@ignasi35 about you
@ignasi35 about me @ignasi35 1) problem solver, Garbage Collector, mostly scala, java 8, agile for tech teams 2) kayaker 3) under construction 4) all things JVM
@ignasi35 FP in Java 8 Pure Functions no side effects if not used, remove it fixed in — fixed out
@ignasi35 FP in Java 8 (T, R) -> Q
@ignasi35 FP in Java 8 Supplier<T> Function<T,R> BiFunction<T,R,Q> Predicate<T> Consumer<T> () -> T (T) -> R (T, R) -> Q (T) -> boolean (T) -> {}
@ignasi35 currying (T, R) -> (Q) -> (S) -> J BiArgumentedPrototipicalFactoryFactoryBean
@ignasi35
@ignasi35 thanks!
@ignasi35 End of presentation
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35 XXIst Century DateTime
@ignasi35 XXIst Century DateTime • Date is DEAD (my opinion) • Calendar is DEAD (my opinion) ! ! • DEAD is 57005 (that’s a fact)
@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime ! • Enum.Month • Enum.DayOfWeek
@ignasi35 XXIst Century DateTime Enum.Month ! • Not just JAN, FEB, MAR • Full arithmetic • plus(long months) • firstDayOfYear(boolean leapYear) • length(boolean leapYear) • …
@ignasi35 XXIst Century DateTime • Clock • replace your sys.currentTimeMillis • allows testing • Instant/now • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime
@ignasi35
@ignasi35 XXIst Century DateTime • Clock • LocalDate • a date • no TimeZone • birth date, end of war, man on moon,… • LocalDateTime • Duration vs Period • ZonedDateTime
@ignasi35
@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • an hour of the day • noon • 9am • Duration vs Period • ZonedDateTime
@ignasi35
@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • Duration: 365*24*60*60*1000 • Period: 1 year (not exactly 365 days) • Duration (Time) vs Period (Date) • ZonedDateTime
@ignasi35
@ignasi35 XXIst Century DateTime • Clock • LocalDate • LocalDateTime • Duration vs Period • ZonedDateTime (not an Instant!!) • Immutable • nanosecond detail • Normal, Gap, Overlap
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35 Lists a1 1 2 3 Nil List<Integer> nil = Lists.nil(); ! List<Integer> a3 = nil.prepend(3); List<Integer> a2 = a3.prepend(2); List<Integer> a1 = a2.prepend(1);
@ignasi35 Lists a1 1 2 3 Nil head(); tail();
@ignasi35 public interface List<T> { T head(); List<T> tail(); boolean isEmpty(); void forEach(Consumer<? super T> f); default List<T> prepend(T t) { return new Cons<>(t, this); } } Lists
@ignasi35 Lists a1 1 2 3 Nil 0 a0 b Cons Cons Cons Cons 4 Cons List<Integer> a0 = a1.prepend(0); List<Integer> b = a1.prepend(4);
@ignasi35 class Cons<T> implements List<T> { private T head; private List<T> tail; Const(T head, List<T> tail) { this.head = head; this.tail = tail; } ! T head(){return this.head;} List<T> tail(){return this.tail;} boolean isEmpty(){return false;} ! void forEach(Consumer<? super T> f){ f.accept(head); tail.forEach(f); } } Lists
@ignasi35 class Nil<T> implements List<T> { ! T head() { throw new NoSuchElementException(); } List<T> tail() { throw new NoSuchElementException(); } boolean isEmpty() { return true; } void forEach(Consumer<? super T> f){ } ! } Lists
@ignasi35 Lists a1 1 2 3 Nil 0 a0 b Cons Cons Cons Cons 4 Cons Persistent Datastructures (not ephemeral, versioning) Immutable As efficient (consider amortised cost)
@ignasi35
@ignasi35 filter class Nil<T> implements List<T> { //… List<T> filter(Predicate<? super T> p) { return this; } } ! class Cons<T> implements List<T> { //… List<T> filter(Predicate<? super T> p) { if (p.test(head)) return new Const<>(head, tail.filter(p)); else return tail.filter(p); } }
@ignasi35 map
@ignasi35 map f
@ignasi35 map class Nil<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return (List<R>) this; } } ! class Cons<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return new Const<>(f.apply(head), tail.map(f)); } }
@ignasi35
@ignasi35 fold f f f
@ignasi35 fold class Nil<T> implements List<T> { <Z> Z reduce(Z z, BiFunction<Z, T, Z> f) { return z; } } ! class Cons<T> implements List<T> { <Z> Z reduce(Z z, BiFunction<Z, T, Z> f) { return tail.reduce(f.apply(z,head), f); } }
@ignasi35 fold aka reduce
@ignasi35 map revisited f
@ignasi35 map revisited f
! @Test void testMapList() { List<List<String>> actual = Lists @ignasi35 .of(“hello world”, “This is sparta”, “asdf asdf”) .map(s -> Lists.of(s.split(“ ”))); ! List<String> expected = Lists.of(“hello”, “world”, “This”, “is”, “sparta”, “asdf”, “asdf”); ! assertEquals(expected, actual); } map revisited
@ignasi35
@ignasi35
@ignasi35
@ignasi35 map f
@ignasi35 flatMap f
@ignasi35 flatMap ! class Cons<T> implements List<T> { //… <R> List<R> map(Function<T, R> f) { return new Const<>(f.apply(head), tail.map(f)); } ! <R> List<R> flatMap(Function<T, List<R> f) { return f.apply(head).append(tail.flatMap(f)); } ! }
@ignasi35
@ignasi35 recap filter ! map ! fold ! flatMap
@ignasi35
@ignasi35 class MyFoo { ! //@param surname may be null Person someFunc(String name, String surname) { … } ! }
@ignasi35 Maybe (aka Optional) replaces null completely
@ignasi35 Maybe (aka Optional) replaces null completely forever
@ignasi35 Maybe (aka Optional) replaces null completely forever and ever
@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever
@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever
@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever and ever
@ignasi35 Maybe (aka Optional) replaces null completely forever and ever and ever and ever and ever and ever
@ignasi35 Maybe (aka Optional) ! class MyFoo { Person someFunc(String name, Optional<String> surname) { … } ! … ! }
@ignasi35 Maybe (aka Optional) ! class MyFoo { Optional<Person> someFunc(Name x, Optional<Surname> y) { … } ! … ! }
@ignasi35 Maybe (aka Optional) Some/Just/Algo ! ! None/Nothing/Nada ADT
@ignasi35
@ignasi35 Maybe (aka Optional) filter: applies predicate and Returns input or None map: converts content fold: returns Some(content) or Some(default) flatMap: see list get: returns content or throws Exception getOrElse: returns content or defaultValue
@ignasi35 recap filter ! map ! fold ! flatMap ADT ! Functor
@ignasi35
@ignasi35
@ignasi35 Future (aka CompletableFuture)
@ignasi35 Future (aka CF, aka CompletableFuture) ! [FAIL] Does not use map, flatMap, filter. ! [PASS] CF implemented ADT ! [FAIL] Because Supplier, Consumer, Function, Bifuction, … CF’s API sucks.
@ignasi35 Future filter: creates new future applying Predicate map: converts content if success. New Future fold: n/a flatMap: see list andThen: chains this Future’s content into a Consumer onSuccess/onFailure: callbacks recover: equivalent to map() but applied only on Fail
@ignasi35 recap filter ! map ! fold ! flatMap ! andThen ADT ! Functor
@ignasi35 recap ! Maybe simulates nullable Future will eventually happen ! Exceptions still fuck up your day
@ignasi35
@ignasi35
@ignasi35 Try Simulates a computation that: ! succeeded or threw exception
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35 Try in action
@ignasi35 Try in action
@ignasi35
@ignasi35 Try in action
@ignasi35
@ignasi35 ! class PersonRepository { Try<Person> loadBy(Name x, Optional<Surname> y) { … } ! … ! } Conclusions
@ignasi35 class SafeDatabase { <T> T withTransaction(Function<Connection, T> block) { … } } ! class AnyAOP { <T> T envolve(Supplier<T> block) { … } } Conclusions
@ignasi35
@ignasi35
@ignasi35 Moar resources https://github.com/rocketscience-projects/javaslang by https://twitter.com/danieldietrich thanks @thomasdarimont for the tip ! https://github.com/functionaljava/functionaljava by http://www.functionaljava.org/ (runs in Java7)
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35
@ignasi35 Namaste
@ignasi35 Questions
@ignasi35 End of presentation
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