Add chain and object methods support for the size() and isEmpty().

Author: javadev

src/main/java/com/github/underscore/$.java

@@ -635,6 +635,10 @@ public static int size(final Iterable<?> iterable) {
         return size;
     }
 
+    public int size() {
+        return size(iterable);
+    }
+
     public static <E> List<List<E>> partition(final Iterable<E> iterable, final Predicate<E> pred) {
         final List<E> retVal1 = newArrayList();
         final List<E> retVal2 = newArrayList();
@@ -1438,6 +1442,10 @@ public static <T> boolean isEmpty(final Iterable<T> iterable) {
         return iterable == null || size(iterable) == 0;
     }
 
+    public boolean isEmpty() {
+        return iterable == null || size(iterable) == 0;
+    }
+
     public static boolean isArray(final Object object) {
         return object != null && object.getClass().isArray();
     }
@@ -1776,6 +1784,14 @@ public <K, V> Chain<Map<K, V>> toMap() {
             return new Chain<Map<K, V>>($.toMap((Iterable<Map.Entry<K, V>>) list));
         }
 
+        public boolean isEmpty() {
+            return $.isEmpty(list);
+        }
+
+        public int size() {
+            return $.size(list);
+        }
+
         public T item() {
             return item;
         }

src/test/java/com/github/underscore/CollectionsTest.java

@@ -1140,6 +1140,10 @@ public void toMap() {
     public void size() {
         final int result = $.size(asList(1, 2, 3, 4));
         assertEquals(4, result);
+        final int resultObj = new $(asList(1, 2, 3, 4)).size();
+        assertEquals(4, resultObj);
+        final int resultChain = $.chain(asList(1, 2, 3, 4)).size();
+        assertEquals(4, resultChain);
     }
 
 /*

src/test/java/com/github/underscore/ObjectsTest.java

@@ -227,6 +227,10 @@ public void isEqual() {
     public void isEmpty() {
         assertTrue($.isEmpty((List) null));
         assertTrue($.isEmpty(new ArrayList<String>()));
+        assertTrue(new $((List) null).isEmpty());
+        assertTrue(new $(new ArrayList<String>()).isEmpty());
+        assertTrue($.chain((List) null).isEmpty());
+        assertTrue($.chain(new ArrayList<String>()).isEmpty());
         assertFalse($.isEmpty(asList("")));
         assertTrue($.isEmpty((Map) null));
         assertTrue($.isEmpty(new HashMap<String, String>()));