@Test
public void testSize() throws Exception {
int size = 100000;
Byte[] bytes = new Byte[size];
for (int i = 0; i < size; i++) {
bytes[i] = (byte) (i % 256);
}
ImmutableList<Byte> byteList = list(bytes);
assertEquals(size, byteList.size());
}
@Test
public void testFilter() throws Exception {
ImmutableList<Integer> list = list(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
Function1<Boolean, Integer> isEven =
new Function1<Boolean, Integer>() {
@Override
public Boolean evaluate(final Function1<Boolean, Integer> self, final Integer i1) {
return i1 % 2 == 0;
}
};
assertEquals(list(2, 4, 6, 8, 10), list.filter(isEven));
}
@Test
public void testMap() throws Exception {
ImmutableList<Integer> list = list(1, 2, 3);
Function1<Integer, Integer> dbl =
new Function1<Integer, Integer>() {
@Override
public Integer evaluate(final Function1<Integer, Integer> self, final Integer i1) {
return i1 * 2;
}
};
ImmutableList<Integer> doubledList = list.map(dbl);
assertEquals(list(2, 4, 6), doubledList);
}
@Test
public void testFlatMap() throws Exception {
ImmutableList<Integer> list = list(1, 2, 3);
// oneToN :: n -> [1..n]
Function1<ImmutableList<Integer>, Integer> oneToN =
new Function1<ImmutableList<Integer>, Integer>() {
@Override
public ImmutableList<Integer> evaluate(
final Function1<ImmutableList<Integer>, Integer> self, final Integer i1) {
ImmutableList<Integer> list = ImmutableList.nil();
for (int i = i1; i >= 1; i--) {
list = list.prepend(i);
}
return list;
}
};
assertEquals(list(1, 1, 2, 1, 2, 3), list.flatMap(oneToN));
}
@Test
public void testFold() {
Function2<String, String, String> concat =
new Function2<String, String, String>() {
@Override
public String evaluate(
final Function2<String, String, String> self, final String i1, final String i2) {
return i1 + i2;
}
};
ImmutableList<String> list = list("a", "b", "c");
assertEquals("dabc", list.foldLeft(concat, "d"));
assertEquals("abcd", list.foldRight(concat, "d"));
ImmutableList<String> emptyList = list();
assertEquals("d", emptyList.foldLeft(concat, "d"));
assertEquals("d", emptyList.foldRight(concat, "d"));
}
