Q3d) When I solved the game of Life problem for labs, I used loops. Can someone post their code using streams for 3d and 3e ?

[DikshantDulal]

[calvinseptyanto]

UnaryOperator<List> rule = x ->
IntStream.range(0, x.size())
.mapToObj(y -> x.get(y) == 0 ?
y == 0 ? x.get(y + 1)
: y == x.size() - 1 ? x.get(y - 1)
: x.get(y - 1) ^ x.get(y + 1)
: 0)
.collect(Collectors.toList());

static Stream conway(List list, UnaryOperator<List> rule, int n) {
return Stream.iterate(list, rule).limit(n)
.map(x -> x.stream().map(y -> y == 0 ? " " : "*").reduce("", (a, b) -> (a + b)));
}

hope this helps!!

[Lucas-Wee]

public static int cell_infect(int i, List x) {
if (i == 0 && x.get(i) == 0 && x.get(i + 1) == 1) {
i = 1; //First cell gets infected
} else if (i == 0 && x.get(i) == 0 && x.get(i + 1) == 0) {
i = 0;
} else if (i == 0 && x.get(i) == 1) {
i = 0; //First cell is infected but become ok
} else if (i == x.size() - 1 && x.get(i) == 0 && x.get(i - 1) == 1) {
i = 1; //Last cell gets infected
} else if (i == x.size() - 1 && x.get(i) == 0 && x.get(i - 1) == 0) {
i = 0;
} else if (i == x.size() - 1 && x.get(i) == 1) {
i = 0; //Last cell is infected but become ok
} else if (x.get(i) == 0 && x.get(i - 1) == 1 && x.get(i + 1) == 1) {
i = 0; //Has 2 alive neighbour
} else if (x.get(i) == 0 && (x.get(i - 1) == 1 | x.get(i + 1) == 1)) {
i = 1; //Has 1 alive only
} else {
i = 0; //Cell is infected but becomes ok
}
return i;
}

public static UnaryOperator<List<Integer>> generateRule() {
    return x -> IntStream.range(0, x.size())
                .map(i -> cell_infect(i, x))
                .boxed()
                .collect(Collectors.toList());
}

public static Stream<String> gameOfLife(List<Integer> list, 
                                        UnaryOperator<List<Integer>> rule, int n) {
    return Stream.<List<Integer>>iterate(list, rule).limit(n)
           .map(x -> x.stream().map(y -> y == 1 ? "*" : " ").reduce("", (a,b) -> a + b));
}

}