Tagged Questions
5
votes
1answer
265 views
Are the Streams in Java 8 monads?
It seems like the Optional in Java 8 is a monad.
Are the Streams also monads?
Can anyone identify the endofunctor and the two natural transformations in the optional monad?
4
votes
1answer
60 views
Java 8 functional: How to compute a list of dependent evolutions of an object?
I want to write the following code in a functional way with streams and lambdas:
Thing thing = new Thing();
List<Thing> things = new ArrayList<>();
things.add(thing);
for (int i = 0; i ...
3
votes
4answers
252 views
Does Java SE 8 have Pairs or Tuples?
I am playing around with lazy functional operations in Java SE 8, and I want to map an index i to a pair / tuple (i, value[i]), then filter based on the second value[i] element, and finally output ...
9
votes
1answer
201 views
A java List that implements the new Stream interface?
I just took some time to start looking into the java-8 buzz about streams and lambdas.
And have a couple of questions...
The first thing that surprised me is that you cannot apply the Stream ...
2
votes
1answer
75 views
Java 8 Stream API to denormalize Map<A, Set<B>> to Map<B, A> without a Pair
I want to do something like the following, but I want to know if there is a more elegant way to do it without the Pair class. The Pair class no longer exists so I would have to create my own class, ...
1
vote
1answer
34 views
Check order of two elements in Java-8-Stream
I want to check the order of two elements in a Java-8-Stream.
I have this Iterator-Solution:
public static boolean isBefore (A a1,
A a2,
...
2
votes
2answers
98 views
How to shuffle a stream using the Stream API?
I decided to take the functional approach in generating a string or random characters, so far I came up with this, it should perform better than boxing and then using a StringJoiner as collector:
...
3
votes
1answer
104 views
Finding average using reduce and collect
I am trying to understand the new Java 8 Stream APIs.
http://docs.oracle.com/javase/tutorial/collections/streams/reduction.html
I found the example of finding average of numbers using collect API. ...
0
votes
2answers
65 views
How to use an infinite java.util.stream.Stream?
Say I have an infinite Stream:
Stream<Socket> stream = Stream.generate(() -> {
try {
return serverSocket.accept();
} catch (IOException e) {
throw new ...
