Miro Cupak mcupak

mcupak / use-optional-or-else.out

Created November 11, 2017 05:50

	jshell> Optional.of("something").orElse("empty")
	$5 ==> "something"

	jshell> Optional.empty().orElse("empty")
	$6 ==> "empty"

mcupak / use-optional-if-present-or-else.out

Created November 11, 2017 05:50

	jshell> Optional.empty().ifPresentOrElse(System.out::println, () -> System.out.println("empty"))
	empty

	jshell> Optional.of("something").ifPresentOrElse(System.out::println, () -> System.out.println("empty"))
	something

mcupak / use-optional-if-present.out

Created November 11, 2017 05:49

	jshell> Optional.empty().ifPresent(System.out::println)

	jshell> Optional.of("something").ifPresent(System.out::println)
	something

mcupak / complete-optional-api.out

Last active November 11, 2017 05:55

	jshell> Optional.of("something").
	equals( filter( flatMap( get() getClass()
	hashCode() ifPresent( ifPresentOrElse( isPresent() map(
	notify() notifyAll() or( orElse( orElseGet(
	orElseThrow( stream() toString() wait(

mcupak / use-optional-is-present.out

Created November 11, 2017 05:47

	jshell> Optional.empty().isPresent()
	$3 ==> false

	jshell> Optional.of("something").isPresent()
	$4 ==> true

mcupak / create-optional-of-something.out

Created November 11, 2017 05:47

	jshell> Optional.of("something")
	$2 ==> Optional[something]

mcupak / create-empty-optional.out

Created November 11, 2017 05:46

	jshell> Optional.empty()
	$1 ==> Optional.empty

mcupak / collect-with-grouping-by-flat-mapping-to-set.out

Created November 10, 2017 01:39

	jshell> entries.collect(Collectors.groupingBy(e -> e.getKey(), Collectors.flatMapping(e -> e.getValue().stream(), Collectors.toSet())))
	$2 ==> {1=[a, b, c], 2=[d]}

mcupak / collect-with-grouping-by-mapping-to-set.out

Created November 10, 2017 01:38

	jshell> entries.collect(Collectors.groupingBy(e -> e.getKey(), Collectors.mapping(e -> e.getValue(), Collectors.toSet())))
	$1 ==> {1=[[b, a], [c, a]], 2=[[d]]}

mcupak / create-stream-of-map-entries.out

Created November 10, 2017 01:37

	jshell> Stream<Map.Entry<Integer,Set<String>>> entries = Stream.of(Map.entry(1, Set.of("a", "b")), Map.entry(1, Set.of("a", "c")), Map.entry(2, Set.of("d")))
	entries ==> java.util.stream.ReferencePipeline$Head@69379752