David Stern

src/main/java/com/booleanuk/core/Exercise.java

@@ -11,35 +11,45 @@ public class Exercise {
 
     public void stepOne() {
         // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
-
-
+        numsZeroToThree = new int[4];
+        for (int i = 0; i < 4; i++) {
+            numsZeroToThree[i] = i;
+        }
     }
 
     public void stepTwo() {
         // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
-
-
+        numsFiveToTen = new int[6];
+        for (int i = 5; i < 11; i++) {
+            numsFiveToTen[i - 5] = i;
+        }
     }
 
     public void stepThree() {
         // TODO: 3. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
-
-
+        countdown = new int[4];
+        for (int i = 3; i >= 0; i--) {
+            countdown[3 - i] = i;
+        }
     }
 
     public boolean stepFour(int num) {
         // TODO: 6. Write a for loop that checks if num is in the favouriteNumbers array
-
-
-
+        for (int i = 0; i < favouriteNumbers.length; i++) {
+            if (favouriteNumbers[i] == num) {
+                return true;
+            }
+        }
         return false;
     }
 
     public boolean stepFive(String hobby) {
         // TODO 5. Write a for loop that checks if the hobby String is in the myHobbies array
-
-
-
+        for (int i = 0; i < myHobbies.length; i++) {
+            if (myHobbies[i].equals(hobby)) {
+                return true;
+            }
+        }
         return false;
     }
 }

src/main/java/com/booleanuk/extension/Extension.java

@@ -5,8 +5,32 @@ public class Extension {
 
     public void stepOne() {
         // TODO: 1. Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+        int countEven = 0;
+        int evenAdded = 0;
+        for (int i = 0; i < 7; i++) {
+            if (i % 2 == 0) {
+                countEven++;
+            }
+        }
 
+        numsEven = new int[countEven];
 
-
+        for (int i = 0; i < 7; i++) {
+            if (i % 2 == 0) {
+                numsEven[evenAdded++] = i;
+            }
+        }
+
+        /*
+        Alternative:
+        List<Integer> evenNums = new ArrayList<>;
+        for (int i = 0; i < 7; i++) {
+            if (i % 2 == 0) {
+                evenNums.add(i);
+            }
+        }
+
+        numsEven = evenNums.stream.mapToInt(Integer::intValue).toArray();
+         */
     }
 }