Add U.explode(string) and U.implode(strings) methods.

Author: Skezzowski

src/main/java/com/github/underscore/lodash/U.java

@@ -1691,6 +1691,37 @@ public static FetchResponse fetch(final String url, final String method, final S
         }
     }
 
+    public static List<String> explode(final String input) {
+        List<String> result = newArrayList();
+        if (isNull(input)) {
+            return result;
+        }
+        for (char character : input.toCharArray()) {
+            result.add(String.valueOf(character));
+        }
+        return result;
+    }
+
+    public static String implode(final String[] input) {
+        StringBuilder builder = new StringBuilder();
+        for (String character : input) {
+            if (nonNull(character)) {
+                builder.append(character);
+            }
+        }
+        return builder.toString();
+    }
+
+    public static String implode(final Iterable<String> input) {
+        StringBuilder builder = new StringBuilder();
+        for (String character: input) {
+            if (nonNull(character)) {
+                builder.append(character);
+            }
+        }
+        return builder.toString();
+    }
+
     public String camelCase() {
         return camelCase(getString().get());
     }

src/test/java/com/github/underscore/lodash/StringTest.java

@@ -23,6 +23,8 @@
  */
 package com.github.underscore.lodash;
 
+import static java.util.Arrays.asList;
+
 import com.github.underscore.BiFunction;
 import com.github.underscore.Consumer;
 import com.github.underscore.Function;
@@ -33,6 +35,7 @@
 
 import java.util.*;
 import org.junit.Test;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
@@ -68,6 +71,28 @@ public void camelCase() {
         assertEquals("a", U.camelCase("\u00c0"));
     }
 
+/*
+_.explode("abc")
+=> ["a", "b", "c"]
+*/
+    @Test
+    public void explode() {
+        assertEquals(asList("a", "b", "c"), U.explode("abc"));
+        assertEquals(U.newArrayList(), U.explode(null));
+    }
+
+/*
+_.implode(["a", "b", "c"]);
+=> "abc"
+*/
+    @Test
+    public void implode() {
+        assertEquals("abc", U.implode(new String[] {"a", "b", "c"}));
+        assertEquals("ac", U.implode(new String[] {"a", null, "c"}));
+        assertEquals("abc", U.implode(asList("a", "b", "c")));
+        assertEquals("ac", U.implode(asList("a", null, "c")));
+    }
+
 /*
 _.lowerFirst('Fred');
 // => 'fred'