Add mapIndexed() for chain.

Author: javadev

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

@@ -115,6 +115,10 @@ public <F> Chain<F> map(final Function<? super T, F> func) {
             return new Chain<F>($.map(value(), func));
         }
 
+        public <F> Chain<F> mapIndexed(final BiFunction<Integer, ? super T, F> func) {
+            return new Chain<F>($.mapIndexed(value(), func));
+        }
+
         public Chain<T> filter(final Predicate<T> pred) {
             return new Chain<T>($.filter(value(), pred));
         }

math-plugin/src/test/java/com/github/underscore/math/MathTest.java

@@ -294,6 +294,8 @@ public void chain() {
         $.chain(new String[] {""}).flatten();
         $.chain(new Integer[] {0}).map(new Function<Integer, Integer>() {
             public Integer apply(Integer value) { return value; } });
+        $.chain(new Integer[] {0}).mapIndexed(new BiFunction<Integer, Integer, Integer>() {
+            public Integer apply(Integer index, Integer value) { return value; } });
         $.chain(new String[] {""}).filter(new Predicate<String>() {
             public boolean test(String str) { return true; } });
         $.chain(new String[] {""}).filterIndexed(new PredicateIndexed<String>() {

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

@@ -2137,6 +2137,10 @@ public <F> Chain<F> map(final Function<? super T, F> func) {
             return new Chain<F>($.map(list, func));
         }
 
+        public <F> Chain<F> mapIndexed(final BiFunction<Integer, ? super T, F> func) {
+            return new Chain<F>($.mapIndexed(list, func));
+        }
+
         public Chain<T> filter(final Predicate<T> pred) {
             return new Chain<T>($.filter(list, pred));
         }

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

@@ -161,6 +161,10 @@ public <F> Chain<F> map(final Function<? super T, F> func) {
             return new Chain<F>($.map(value(), func));
         }
 
+        public <F> Chain<F> mapIndexed(final BiFunction<Integer, ? super T, F> func) {
+            return new Chain<F>($.mapIndexed(value(), func));
+        }
+
         public Chain<T> filter(final Predicate<T> pred) {
             return new Chain<T>($.filter(value(), pred));
         }

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

@@ -261,6 +261,12 @@ public Integer apply(Integer index, Integer item) {
             }
         });
         assertEquals("[3, 6, 9]", resultObject.toString());
+        List<Integer> resultChain = $.chain(asList(1, 2, 3)).mapIndexed(new BiFunction<Integer, Integer, Integer>() {
+            public Integer apply(Integer index, Integer item) {
+                return item * 3;
+            }
+        }).value();
+        assertEquals("[3, 6, 9]", resultChain.toString());
     }
 
 /*

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

@@ -603,6 +603,8 @@ public void chain() {
         $.chain(new String[] {""}).flatten();
         $.chain(new Integer[] {0}).map(new Function<Integer, Integer>() {
             public Integer apply(Integer value) { return value; } });
+        $.chain(new Integer[] {0}).mapIndexed(new BiFunction<Integer, Integer, Integer>() {
+            public Integer apply(Integer index, Integer value) { return value; } });
         $.chain(new String[] {""}).filter(new Predicate<String>() {
             public boolean test(String str) { return true; } });
         $.chain(new String[] {""}).filterIndexed(new PredicateIndexed<String>() {

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

@@ -152,6 +152,10 @@ public <F> Chain<F> map(final Function<? super T, F> func) {
             return new Chain<F>($.map(value(), func));
         }
 
+        public <F> Chain<F> mapIndexed(final BiFunction<Integer, ? super T, F> func) {
+            return new Chain<F>($.mapIndexed(value(), func));
+        }
+
         public Chain<T> filter(final Predicate<T> pred) {
             return new Chain<T>($.filter(value(), pred));
         }

string-plugin/src/test/java/com/github/underscore/string/StringTest.java

@@ -1992,6 +1992,8 @@ public void chain() {
         $.chain(new String[] {""}).flatten();
         $.chain(new Integer[] {0}).map(new Function<Integer, Integer>() {
             public Integer apply(Integer value) { return value; } });
+        $.chain(new Integer[] {0}).mapIndexed(new BiFunction<Integer, Integer, Integer>() {
+            public Integer apply(Integer index, Integer value) { return value; } });
         $.chain(new String[] {""}).filter(new Predicate<String>() {
             public boolean test(String str) { return true; } });
         $.chain(new String[] {""}).filterIndexed(new PredicateIndexed<String>() {