Add support for the flattenDeep().

Author: javadev

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

@@ -79,6 +79,10 @@ public Chain<List<Object>> fill(Object value) {
         public Chain<List<Object>> fill(Object value, Integer start, Integer end) {
             return new Chain<List<Object>>($.fill((List<Object>) value(), value, start, end));
         }
+
+        public Chain<List<?>> flattenDeep() {
+            return new Chain<List<?>>($.flattenDeep((List<?>) value()));
+        }
     }
 
     public static Chain chain(final String item) {
@@ -182,6 +186,14 @@ public List<Object> fill(Object value, Integer start, Integer end) {
         return fill((List<Object>) getIterable(), value, start, end);
     }
 
+    public static <E> List<E> flattenDeep(final List<?> list) {
+        return flatten(list, false);
+    }
+
+    public List<T> flattenDeep() {
+        return flattenDeep((List<?>) getIterable());
+    }
+
     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

@@ -187,6 +187,20 @@ public void fill() {
         assertEquals("[4, *, 8]", array.toString());
     }
 
+/*
+_.flattenDeep([1, [2, 3, [4]]]);
+// → [1, 2, 3, 4]
+*/
+    @Test
+    public void flattenDeep() {
+        final List<Integer> result = $.flattenDeep(asList(1, asList(2, 3, asList(asList(4)))));
+        assertEquals("[1, 2, 3, 4]", result.toString());
+        final List<Integer> result2 = new $(asList(1, asList(2, 3, asList(asList(4))))).flattenDeep();
+        assertEquals("[1, 2, 3, 4]", result2.toString());
+        final List<Integer> resultChain = $.chain(asList(1, asList(2, 3, asList(asList(4))))).flattenDeep().value();
+        assertEquals("[1, 2, 3, 4]", resultChain.toString());
+    }
+
     @Test
     public void main() {
         $.main(new String[] {});