Add support for the dropWhile().

Author: javadev

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

@@ -24,6 +24,7 @@
 package com.github.underscore.lodash;
 
 import java.util.*;
+import com.github.underscore.Predicate;
 
 public class $<T> extends com.github.underscore.$<T> {
 
@@ -62,6 +63,10 @@ public Chain<List<T>> dropRight() {
         public Chain<List<T>> dropRight(final Integer n) {
             return new Chain<List<T>>($.dropRight(value(), n));
         }
+
+        public Chain<List<T>> dropWhile(final Predicate<T> pred) {
+            return new Chain<List<T>>($.dropWhile(value(), pred));
+        }
     }
 
     public static Chain chain(final String item) {
@@ -127,6 +132,14 @@ public List<T> dropRight(final Integer n) {
         return dropRight(getIterable(), n);
     }
 
+    public static <T> List<T> dropWhile(final Iterable<T> iterable, final Predicate<T> pred) {
+        return rest(newArrayList(iterable), findIndex(newArrayList(iterable), negate(pred)));
+    }
+
+    public List<T> dropWhile(final Predicate<T> pred) {
+        return dropWhile(getIterable(), pred);
+    }
+
     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

@@ -25,6 +25,7 @@
 
 import java.util.*;
 import org.junit.Test;
+import com.github.underscore.Predicate;
 import static java.util.Arrays.asList;
 import static org.junit.Assert.assertEquals;
 
@@ -100,6 +101,31 @@ public void dropRight() {
         assertEquals("[1, 2, 3]", $.dropRight(asList(1, 2, 3), 0).toString());
     }
 
+/*
+_.dropWhile([1, 2, 3], function(n) {
+  return n < 3;
+});
+// → [3]
+*/
+    @Test
+    public void dropWhile() {
+        assertEquals("[3]", $.dropWhile(asList(1, 2, 3), new Predicate<Integer>() {
+            public Boolean apply(Integer n) {
+                return n < 3;
+            }
+        }).toString());
+        assertEquals("[3]", new $(asList(1, 2, 3)).dropWhile(new Predicate<Integer>() {
+            public Boolean apply(Integer n) {
+                return n < 3;
+            }
+        }).toString());
+        assertEquals("[3]", $.chain(asList(1, 2, 3)).dropWhile(new Predicate<Integer>() {
+            public Boolean apply(Integer n) {
+                return n < 3;
+            }
+        }).toString());
+    }
+
     @Test
     public void main() {
         $.main(new String[] {});