Luis Romero 6 yıl önce
ebeveyn
işleme
8780408f4a

+ 1
- 1
src/main/java/ArrayListCombiner/ArrayListCombiner.java Dosyayı Görüntüle

@@ -8,7 +8,7 @@ import java.util.ArrayList;
8 8
  * The first method should be called extendCombiner and should use ? extends E
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  * The second method should be called superCombiner and should use ? super E
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  */
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-public class ArrayListCombiner<E> {
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+public class ArrayListCombiner {
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     public static <E> void extendCombiner(ArrayList<E> first, ArrayList<? extends E> second) {
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         first.addAll(second);

+ 9
- 0
src/main/java/MapFunc/MapFunc.java Dosyayı Görüntüle

@@ -9,4 +9,13 @@ import java.util.function.Function;
9 9
  */
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 public class MapFunc {
11 11
 
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+    public static <T, R> ArrayList<R> map(ArrayList<T> input, Function<T, R> function) {
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+        ArrayList<R> finalArray = new ArrayList<>();
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+        for (T itemToChange : input) {
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+            R result = function.apply(itemToChange);
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+            finalArray.add(result);
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+        }
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+        return finalArray;
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+    }
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+
12 21
 }

+ 36
- 36
src/test/java/MapFunc/MapFuncTest.java Dosyayı Görüntüle

@@ -1,36 +1,36 @@
1
-//package MapFunc;
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-//
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-//import MapFunc.MapFunc;
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-//import org.junit.Test;
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-//
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-//import java.util.ArrayList;
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-//import org.junit.Assert;
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-//
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-//public class MapFuncTest {
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-//    @Test
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-//    public void testSingleTypeMap() throws Exception {
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-//        // Given an integer array list
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-//        ArrayList<Integer> intList = new ArrayList<>();
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-//        intList.add(1);
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-//        intList.add(2);
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-//        // When it's mapped with a function to double the value
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-//        ArrayList<Integer> mappedList = MapFunc.map(intList, num -> num*2);
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-//        // Then all the values are doubled
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-//        Assert.assertEquals(new Integer(2), mappedList.get(0));
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-//        Assert.assertEquals(new Integer(4), mappedList.get(1));
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-//    }
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-//
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-//    @Test
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-//    public void testMultipleTypeMap() throws Exception {
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-//        // Given an integer array list
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-//        ArrayList<Integer> intList = new ArrayList<>();
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-//        intList.add(1);
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-//        intList.add(2);
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-//        // When it's mapped with to string
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-//        ArrayList<String> mappedList = MapFunc.map(intList, num -> num.toString());
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-//        // Then all the values are doubled
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-//        Assert.assertEquals("1", mappedList.get(0));
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-//        Assert.assertEquals("2", mappedList.get(1));
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-//    }
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-//
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-//}
1
+package MapFunc;
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+
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+import MapFunc.MapFunc;
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+import org.junit.Test;
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+
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+import java.util.ArrayList;
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+import org.junit.Assert;
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+
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+public class MapFuncTest {
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+    @Test
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+    public void testSingleTypeMap() throws Exception {
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+        // Given an integer array list
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+        ArrayList<Integer> intList = new ArrayList<>();
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+        intList.add(1);
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+        intList.add(2);
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+        // When it's mapped with a function to double the value
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+        ArrayList<Integer> mappedList = MapFunc.map(intList, num -> num*2);
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+        // Then all the values are doubled
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+        Assert.assertEquals(new Integer(2), mappedList.get(0));
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+        Assert.assertEquals(new Integer(4), mappedList.get(1));
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+    }
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+
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+    @Test
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+    public void testMultipleTypeMap() throws Exception {
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+        // Given an integer array list
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+        ArrayList<Integer> intList = new ArrayList<>();
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+        intList.add(1);
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+        intList.add(2);
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+        // When it's mapped with to string
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+        ArrayList<String> mappedList = MapFunc.map(intList, num -> num.toString());
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+        // Then all the values are doubled
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+        Assert.assertEquals("1", mappedList.get(0));
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+        Assert.assertEquals("2", mappedList.get(1));
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+    }
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+
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+}