Improve $.join(iterable, separator) method.

Author: javadev

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

@@ -2150,14 +2150,14 @@ public List<Comparable> sort() {
 
     public static <T> String join(final Iterable<T> iterable, final String separator) {
         final StringBuilder sb = new StringBuilder();
-        each(iterable, new Block<T>() {
-            public void apply(T item) {
-                if (!sb.toString().isEmpty()) {
-                    sb.append(separator);
-                }
-                sb.append(item.toString());
+        int index = 0;
+        for (final T item : iterable) {
+            if (index > 0) {
+                sb.append(separator);
             }
-        });
+            sb.append(item.toString());
+            index += 1;
+        }
         return sb.toString();
     }
 

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

@@ -1,7 +1,7 @@
 /*
  * The MIT License (MIT)
  *
- * Copyright 2015 Valentyn Kolesnikov
+ * Copyright 2015, 2016 Valentyn Kolesnikov
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -83,6 +83,7 @@ public void join() {
         assertEquals("some words example", new $(asList("some", "words", "example")).join());
         assertEquals("some words example", $.join(new String[] {"some", "words", "example"}));
         assertEquals("some words example", $.chain(asList("some", "words", "example")).join().item());
+        assertEquals("--", $.join(asList("", "", ""), "-"));
     }
 
     @Test