Add support for $.get(list, index), $.get(index), $.set(list, index,

value) and $.set(index, value) methods.

Author: javadev

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

@@ -2604,6 +2604,25 @@ public T elementAt(final int index) {
         return elementAt((List<T>) value(), index);
     }
 
+    public static <T> T get(final List<T> list, final int index) {
+        return elementAt(list, index);
+    }
+
+    @SuppressWarnings("unchecked")
+    public T get(final int index) {
+        return elementAt((List<T>) value(), index);
+    }
+
+    public static <T> Tuple<T, List<T>> set(final List<T> list, final int index, final T value) {
+        final List<T> newList = newArrayList(list);
+        return Tuple.create(newList.set(index, value), newList);
+    }
+
+    @SuppressWarnings("unchecked")
+    public Tuple<T, List<T>> set(final int index, final T value) {
+        return set((List<T>) value(), index, value);
+    }
+
     public static <T> T elementAtOrElse(final List<T> list, final int index, T defaultValue) {
         try {
             return list.get(index);

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

@@ -208,6 +208,32 @@ public void elementAt() {
         assertEquals(2, new $<Integer>(asList(1, 2, 3)).elementAt(1).intValue());
     }
 
+/*
+var arr = [ 1, 2, 3 ]
+_.get(arr, 1) // => 2
+*/
+    @Test
+    @SuppressWarnings("unchecked")
+    public void get() {
+        assertEquals(2, $.<Integer>get(asList(1, 2, 3), 1).intValue());
+        assertEquals(2, new $<Integer>(asList(1, 2, 3)).get(1).intValue());
+    }
+
+/*
+var arr = [ 1, 2, 3 ]
+_.set(arr, 1, 100) // => 2
+*/
+    @Test
+    @SuppressWarnings("unchecked")
+    public void set() {
+        Tuple<Integer, List<Integer>> result = $.<Integer>set(asList(1, 2, 3), 1, 100);
+        assertEquals(2, result.fst().intValue());
+        assertEquals(100, $.<Integer>get(result.snd(), 1).intValue());
+        Tuple<Integer, List<Integer>> result2 = new $<Integer>(asList(1, 2, 3)).set(2, 200);
+        assertEquals(3, result2.fst().intValue());
+        assertEquals(200, result2.snd().get(2).intValue());
+    }
+
 /*
 var arr = [ 1, 2, 3 ]
 _.elementAt(arr, 3) // => IndexOutOfBoundsException