Add object-oriented methods for filter and reject.

Author: javadev

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

@@ -320,6 +320,16 @@ public static <E> List<E> filter(final List<E> list, final Predicate<E> pred) {
         return filtered;
     }
 
+    public List<T> filter(final Predicate<T> pred) {
+        final List<T> filtered = newArrayList();
+        for (final T element : value()) {
+            if (pred.apply(element)) {
+                filtered.add(element);
+            }
+        }
+        return filtered;
+    }
+
     public static <E> List<E> filterIndexed(final List<E> list, final PredicateIndexed<E> pred) {
         final List<E> filtered = newArrayList();
         int index = 0;
@@ -359,6 +369,15 @@ public Boolean apply(E input) {
         });
     }
 
+    public List<T> reject(final Predicate<T> pred) {
+        return filter(new Predicate<T>() {
+            @Override
+            public Boolean apply(T input) {
+                return !pred.apply(input);
+            }
+        });
+    }
+
     public static <E> List<E> rejectIndexed(final List<E> list, final PredicateIndexed<E> pred) {
         return filterIndexed(list, new PredicateIndexed<E>() {
             @Override

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

@@ -509,6 +509,13 @@ public Boolean apply(Integer item) {
             }
         });
         assertEquals("[2, 4, 6]", result.toString());
+        final List<Integer> resultObject = new $<Integer>(asList(1, 2, 3, 4, 5, 6))
+            .filter(new Predicate<Integer>() {
+            public Boolean apply(Integer item) {
+                return item % 2 == 0;
+            }
+        });
+        assertEquals("[2, 4, 6]", resultObject.toString());
     }
 
 /*
@@ -571,6 +578,13 @@ public Boolean apply(Integer item) {
             }
         });
         assertEquals("[1, 3, 5]", result.toString());
+        final List<Integer> resultObject = new $<Integer>(asList(1, 2, 3, 4, 5, 6))
+            .reject(new Predicate<Integer>() {
+            public Boolean apply(Integer item) {
+                return item % 2 == 0;
+            }
+        });
+        assertEquals("[1, 3, 5]", resultObject.toString());
         final Set<Integer> resultSet = $.reject(new LinkedHashSet(asList(1, 2, 3, 4, 5, 6)),
             new Predicate<Integer>() {
             public Boolean apply(Integer item) {