Level-6

src/main/java/Duke.java

@@ -45,6 +45,19 @@ public static void main(String[] args) {
                             System.out.println(task.markedAsDoneToString());
                         }
                     }
+                } else if (input.startsWith("delete")) {
+                    if (input.equals("delete") || input.equals("delete ")) {
+                        throw new DukeException("An index must follow after the command word 'delete'.");
+                    } else {
+                        int arrIndex = Integer.valueOf(input.substring(7)) - 1;
+                        if (arrIndex < 0 || arrIndex >= ls.getSize()) {
+                            throw new DukeException("Item does not exist in the list.");
+                        } else {
+                            Task task = ls.getTask(arrIndex);
+                            ls.removeTask(arrIndex);
+                            System.out.println(ls.removeTaskToString(task));
+                        }
+                    }
                 } else {
                     if (input.startsWith("todo")) {
                         String taskDesc = input.replaceFirst("^todo", "");

src/main/java/TaskList.java

@@ -19,6 +19,16 @@ public String addTaskToString(Task task) {
                 + "\nNow you have " + this.tasklist.size() + " tasks in the list.");
     }
 
+    public void removeTask(int index) {
+        this.tasklist.remove(index);
+    }
+
+    public String removeTaskToString(Task task) {
+        return ("Noted. I've removed this task: \n" +
+                task.toString()
+                + "\nNow you have " + this.tasklist.size() + " tasks in the list.");
+    }
+
     public Task getTask(int index) {
         return this.tasklist.get(index);
     }