Data commit

Task/Apply-a-callback-to-an-array/Java/apply-a-callback-to-an-array-1.java

@@ -0,0 +1,45 @@
+public class ArrayCallback7 {
+
+    interface IntConsumer {
+        void run(int x);
+    }
+
+    interface IntToInt {
+        int run(int x);
+    }
+
+    static void forEach(int[] arr, IntConsumer consumer) {
+        for (int i : arr) {
+            consumer.run(i);
+        }
+    }
+
+    static void update(int[] arr, IntToInt mapper) {
+        for (int i = 0; i < arr.length; i++) {
+            arr[i] = mapper.run(arr[i]);
+        }
+    }
+
+    public static void main(String[] args) {
+        int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+
+        forEach(numbers, new IntConsumer() {
+            public void run(int x) {
+                System.out.println(x);
+            }
+        });
+
+        update(numbers, new IntToInt() {
+            @Override
+            public int run(int x) {
+                return x * x;
+            }
+        });
+
+        forEach(numbers, new IntConsumer() {
+            public void run(int x) {
+                System.out.println(x);
+            }
+        });
+    }
+}

Task/Apply-a-callback-to-an-array/Java/apply-a-callback-to-an-array-2.java

@@ -0,0 +1,17 @@
+import java.util.Arrays;
+
+public class ArrayCallback {
+
+    public static void main(String[] args) {
+        int[] myIntArray = {1, 2, 3, 4, 5};
+
+        int sum = Arrays.stream(myIntArray)
+                .map(x -> {
+                    int cube = x * x * x;
+                    System.out.println(cube);
+                    return cube;
+                })
+                .reduce(0, (left, right) -> left + right); // <-- could substitute .sum() for .reduce(...) here.
+        System.out.println("sum: " + sum);
+    }
+}