Add support for the xor().

Author: javadev

lodash-plugin/src/main/java/com/github/underscore/lodash/$.java

@@ -91,6 +91,10 @@ public Chain<List<Object>> pull(Object ... values) {
         public Chain<List<Object>> pullAt(Integer ... indexes) {
             return new Chain<List<Object>>($.pullAt((List<Object>) value(), indexes));
         }
+
+        public Chain<List<T>> xor(final List<T> list) {
+            return new Chain<List<T>>($.xor(value(), list));
+        }
     }
 
     public static Chain chain(final String item) {
@@ -236,6 +240,21 @@ public List<Object> pullAt(Integer ... indexes) {
         return pullAt((List<Object>) getIterable(), indexes);
     }
 
+    public static <T> List<T> xor(final List<T> ... lists) {
+        int index = -1;
+        int length = lists.length;
+        List<T> result = null;
+        while (++index < length) {
+            final List<T> array = lists[index];
+            result = result == null ? array : concat(difference(result, array), difference(array, result));
+        }
+        return uniq(result);
+    }
+
+    public List<T> xor(final List<T> list) {
+        return xor((List<T>) getIterable(), list);
+    }
+
     public static void main(String ... args) {
         final String message = "Underscore-java-lodash is a lodash plugin for underscore-java.\n\n"
             + "For docs, license, tests, and downloads, see: http://javadev.github.io/underscore-java";

lodash-plugin/src/test/java/com/github/underscore/lodash/LodashTest.java

@@ -247,6 +247,17 @@ public void pullAt() {
         assertEquals("[10, 20]", events.toString());
     }
 
+/*
+_.xor([1, 2], [4, 2]);
+// → [1, 4]
+*/
+    @Test
+    public void xor() {
+        assertEquals("[1, 4]", $.xor(asList(1, 2), asList(4, 2)).toString());
+        assertEquals("[1, 4]", new $(asList(1, 2)).xor(asList(4, 2)).toString());
+        assertEquals("[1, 4]", $.chain(asList(1, 2)).xor(asList(4, 2)).toString());
+    }
+
     @Test
     public void main() {
         $.main(new String[] {});