Add support for chunk method in chain.

Author: javadev

.travis.yml

@@ -10,4 +10,5 @@ script:
   - mvn clean package jacoco:report coveralls:jacoco
   - mvn -f math-plugin/pom.xml clean package jacoco:report
   - mvn -f string-plugin/pom.xml clean package jacoco:report
+  - mvn -f lodash-plugin/pom.xml clean package jacoco:report
 

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

@@ -42,6 +42,10 @@ public Chain(final T item) {
         public Chain(final List<T> list) {
             super(list);
         }
+
+        public Chain<List<List<T>>> chunk(final Integer size) {
+            return new Chain<List<List<T>>>($.chunk(value(), size));
+        }
     }
 
     public static Chain chain(final String item) {
@@ -60,17 +64,21 @@ public static <T> Chain chain(final T ... list) {
         return new $.Chain<T>(Arrays.asList(list));
     }
 
-    public static <T> List<List<T>> chunk(final List<T> list, final Integer size) {
+    public static <T> List<List<T>> chunk(final Iterable<T> list, final Integer size) {
         int index = 0;
-        int length = list.size();
+        int length = size(list);
         final List<List<T>> result = new ArrayList<List<T>>(length / size);
         while (index < length) {
-            result.add(list.subList(index, Math.min(length, index + size)));
+            result.add(newArrayList(list).subList(index, Math.min(length, index + size)));
             index += size;
         }
         return result;
     }
 
+    public List<List<T>> chunk(final Integer size) {
+        return chunk(getIterable(), size);
+    }
+
     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

@@ -45,6 +45,8 @@ public class LodashTest {
     @Test
     public void chunk() {
         assertEquals("[[a, b], [c, d]]", $.chunk(asList("a", "b", "c", "d"), 2).toString());
+        assertEquals("[[a, b], [c, d]]", new $(asList("a", "b", "c", "d")).chunk(2).toString());
+        assertEquals("[[a, b], [c, d]]", $.chain(asList("a", "b", "c", "d")).chunk(2).value().toString());
         assertEquals("[[a, b, c], [d]]", $.chunk(asList("a", "b", "c", "d"), 3).toString());
     }