v0.11.0 (#86)

* `Chainable#crossSelf()`

pom.xml

@@ -4,7 +4,7 @@
 
 	<groupId>com.github.chainables</groupId>
 	<artifactId>chainable</artifactId>
-	<version>0.10.1</version>
+	<version>0.11.0</version>
 	<packaging>jar</packaging>
 
 	<name>${project.groupId}:${project.artifactId}</name>

src/main/java/com/github/chainables/chainable/Chainable.java

@@ -864,6 +864,14 @@ default <V> Chainable<Pair<T, V>> cross(Iterable<? extends V> items) {
         return Chainables.cross(this, items);
     }
 
+    /**
+     * Produces all the pairwise combinations of this chain with itself.
+     * @return a chain of pairs of all the combinations of items from this chain
+     */
+    default <V> Chainable<Pair<T, T>> crossSelf() {
+        return Chainables.cross(this, this);
+    }
+
     /**
      * Traverses the items in a depth-first (pre-order) manner, by visiting the children of each item in the chain, as returned by the
      * specified {@code childExtractor} before visting its siblings, in a de-facto recursive manner.

src/test/java/com/github/chainables/chainable/ChainableTest.java

@@ -604,6 +604,30 @@ public void testCross() {
         assertTrue(crossChainEmpty.isEmpty());
     }
 
+    @Test
+    public void testCrossSelft() {
+        // Given
+        String[] items = { "a", "b", "c", "d" };
+        long expectedLength = items.length * items.length;
+        Chainable<String> chain = chain(items);
+        List<Pair<String, String>> expected = new ArrayList<>();
+
+        for (int i = 0; i < items.length; i++) {
+            for (int j = 0; j < items.length; j++) {
+                Pair<String, String> pair = Pair.from(items[i], items[j]);
+                expected.add(pair);
+            }
+        }
+
+        // When
+        Chainable<Pair<String, String>> crossChain = chain.crossSelf();
+        ChainableList<Pair<String, String>> actual = crossChain.toList();
+
+        // Then
+        assertEquals(expectedLength, actual.size());
+        assertTrue(actual.containsAll(expected));
+    }
+
     @Test
     public void testDepthFirst() {
         // Given