Add methods last, initial, rest to the chain().

Author: javadev

README.md

@@ -19,7 +19,7 @@ Add this dependency to your project's POM:
     <dependency>
       <groupId>com.github.javadev</groupId>
       <artifactId>underscore</artifactId>
-      <version>1.1</version>
+      <version>1.2</version>
     </dependency>
 
 Underscore-java is a java port of [Underscore.js](http://underscorejs.org/).

pom-central.xml

@@ -5,7 +5,7 @@
   <groupId>com.github.javadev</groupId>
   <artifactId>underscore</artifactId>
   <packaging>jar</packaging>
-  <version>1.1</version>
+  <version>1.2</version>
   <name>java port of Underscore.js</name>
   <description>The java port of Underscore.js</description>
   <url>https://github.com/javadev/underscore-java</url>

pom.xml

@@ -5,7 +5,7 @@
   <groupId>com.github.javadev</groupId>
   <artifactId>underscore</artifactId>
   <packaging>jar</packaging>
-  <version>1.1</version>
+  <version>1.2</version>
   <name>java port of Underscore.js</name>
   <description>The java port of Underscore.js</description>
   <url>https://github.com/javadev/underscore-java</url>

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

@@ -853,6 +853,14 @@ public static <T> Chain chain(final List<T> list) {
         return new _.Chain<T>(list);
     }
 
+    public static <T> Chain chain(final Set<T> list) {
+        return new _.Chain<T>(new ArrayList<T>(list));
+    }
+
+    public static <T> Chain chain(final T[] list) {
+        return new _.Chain<T>(Arrays.asList(list));
+    }
+
     public static class Chain<T> {
         private final T item;
         private final List<T> list;
@@ -869,6 +877,26 @@ public Chain<T> first() {
             return new Chain<T>(_.first(list));
         }
 
+        public Chain<T> initial() {
+            return new Chain<T>(_.initial(list));
+        }
+
+        public Chain<T> initial(int n) {
+            return new Chain<T>(_.initial(list, n));
+        }
+
+        public Chain<T> last() {
+            return new Chain<T>(_.last(list));
+        }
+
+        public Chain<T> rest() {
+            return new Chain<T>(_.rest(list));
+        }
+
+        public Chain<T> rest(int n) {
+            return new Chain<T>(_.rest(list, n));
+        }
+
         public Chain<T> flatten() {
             List<T> flattened = new ArrayList<T>();
             flatten(list, flattened);
@@ -1042,16 +1070,6 @@ public static <T> String join(final T[] array, final String separator) {
         return join(Arrays.asList(array), separator);
     }
 
-    public static <T> T[] concat(final T[] first, final T[] second) {
-        final T[] result = Arrays.copyOf(first, first.length + second.length);
-        System.arraycopy(second, 0, result, first.length, second.length);
-        return result;
-    }
-
-    public static <T> List<T> concat(final List<T> first, final List<T> second) {
-        return (List<T>) Arrays.asList(_.concat(first.toArray(), second.toArray()));
-    }
-
     public static <T> T[] concat(final T[] first, final T[] ... other) {
         int length = 0;
         for (T[] otherItem : other) {

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

@@ -511,6 +511,8 @@ public String toString() {
     public void first() {
         final Integer result = _.first(asList(5, 4, 3, 2, 1));
         assertEquals("5", result.toString());
+        final Object resultChain = _.chain(asList(5, 4, 3, 2, 1)).first().item();
+        assertEquals("5", resultChain.toString());
         final List<Integer> resultList = _.first(asList(5, 4, 3, 2, 1), 2);
         assertEquals("[5, 4]", resultList.toString());
         final int resultInt = _.first(new Integer[] {5, 4, 3, 2, 1});
@@ -547,8 +549,12 @@ public void head() {
     public void initial() {
         final List<Integer> result = _.initial(asList(5, 4, 3, 2, 1));
         assertEquals("[5, 4, 3, 2]", result.toString());
+        final List<Integer> resultChain = _.chain(asList(5, 4, 3, 2, 1)).initial().value();
+        assertEquals("[5, 4, 3, 2]", resultChain.toString());
         final List<Integer> resultList = _.initial(asList(5, 4, 3, 2, 1), 2);
         assertEquals("[5, 4, 3]", resultList.toString());
+        final List<Integer> resultListChain = _.chain(asList(5, 4, 3, 2, 1)).initial(2).value();
+        assertEquals("[5, 4, 3]", resultListChain.toString());
         final Integer[] resultArray = _.initial(new Integer[] {5, 4, 3, 2, 1});
         assertEquals("[5, 4, 3, 2]", asList(resultArray).toString());
         final Integer[] resultListArray = _.initial(new Integer[] {5, 4, 3, 2, 1}, 2);
@@ -563,6 +569,8 @@ public void initial() {
     public void last() {
         final Integer result = _.last(asList(5, 4, 3, 2, 1));
         assertEquals("1", result.toString());
+        final Object resultChain = _.chain(asList(5, 4, 3, 2, 1)).last().item();
+        assertEquals("1", resultChain.toString());
         final Integer resultArray = _.last(new Integer[] {5, 4, 3, 2, 1});
         assertEquals("1", resultArray.toString());
     }
@@ -617,8 +625,12 @@ public void drop() {
     public void rest() {
         final List<Integer> result = _.rest(asList(5, 4, 3, 2, 1));
         assertEquals("[4, 3, 2, 1]", result.toString());
+        final List<Integer> resultChain = _.chain(asList(5, 4, 3, 2, 1)).rest().value();
+        assertEquals("[4, 3, 2, 1]", resultChain.toString());
         final List<Integer> result2 = _.rest(asList(5, 4, 3, 2, 1), 2);
         assertEquals("[3, 2, 1]", result2.toString());
+        final List<Integer> result2Chain = _.chain(asList(5, 4, 3, 2, 1)).rest(2).value();
+        assertEquals("[3, 2, 1]", result2Chain.toString());
         final Object[] resultArray = _.rest(new Integer[] {5, 4, 3, 2, 1});
         assertEquals("[4, 3, 2, 1]", asList(resultArray).toString());
         final Object[] resultArray2 = _.rest(new Integer[] {5, 4, 3, 2, 1}, 2);
@@ -1128,6 +1140,54 @@ public String apply(Map<String, Object> item) {
         assertEquals("moe is 21", youngest);
     }
 
+    @Test
+    public void chainSet() throws Exception {
+        final Set<Map<String, Object>> stooges = new HashSet<Map<String, Object>>() {{
+            add(new LinkedHashMap<String, Object>() {{ put("name", "curly"); put("age", 25); }});
+            add(new LinkedHashMap<String, Object>() {{ put("name", "moe"); put("age", 21); }});
+            add(new LinkedHashMap<String, Object>() {{ put("name", "larry"); put("age", 23); }});
+        }};
+        final String youngest = _.chain(stooges)
+            .sortBy(
+                new Function1<Map<String, Object>, String>() {
+                public String apply(Map<String, Object> item) {
+                    return item.get("age").toString();
+                }
+            })
+            .map(
+                new Function1<Map<String, Object>, String>() {
+                public String apply(Map<String, Object> item) {
+                    return item.get("name") + " is " + item.get("age");
+                }
+            })
+            .first().item().toString();
+        assertEquals("moe is 21", youngest);
+    }
+
+    @Test
+    public void chainArray() throws Exception {
+        final List<Map<String, Object>> stooges = new ArrayList<Map<String, Object>>() {{
+            add(new LinkedHashMap<String, Object>() {{ put("name", "curly"); put("age", 25); }});
+            add(new LinkedHashMap<String, Object>() {{ put("name", "moe"); put("age", 21); }});
+            add(new LinkedHashMap<String, Object>() {{ put("name", "larry"); put("age", 23); }});
+        }};
+        final String youngest = _.chain(stooges.toArray())
+            .sortBy(
+                new Function1<Map<String, Object>, String>() {
+                public String apply(Map<String, Object> item) {
+                    return item.get("age").toString();
+                }
+            })
+            .map(
+                new Function1<Map<String, Object>, String>() {
+                public String apply(Map<String, Object> item) {
+                    return item.get("name") + " is " + item.get("age");
+                }
+            })
+            .first().item().toString();
+        assertEquals("moe is 21", youngest);
+    }
+
 /*
 var lyrics = [
   {line: 1, words: "I'm a lumberjack and I'm okay"},