How to initialise and use array in game assignment

Processing Coding Questions
8

I have added these commands in the declaration part and the void draw() function but nothing has changed

int noInvader;
int[] invaderHorde = new int[8];

for (int i = 0; i <= 7; i++) {
    invaderHorde[i] = noInvader;
    if (gap == width - x) {
      invaderHorde = append(invaderHorde, invader);
    }
  }