Newbie Question about using "void setup()"

Projects Programming
2

Why is the debounce function in void setup()

It is not. There are only two statements in the setup function. The function definition is surrounded by { and }

The debounce function is called from the loop function in this line:-

currentButton = debounce(lastButton);

The code:-

boolean debounce(boolean last)
{
  boolean current = digitalRead(BUTTON);
  if (last != current)
  {
    delay(5);
    current = digitalRead(BUTTON);
   
  return current;
  }
}

Is a new function your code has defined, it's name is debounce