shaun-better practices

// code is not verified to work.  just illustrating some changes to be made.

int delaytime = 2000;
int switchpin = 8;
int ledpin = 13;
bool statechanged = false;  // notice how this is different?
bool lastbutton = LOW;
bool currentButton = LOW;


void setup()
{
  pinMode(ledpin, OUTPUT);
  pinMode(switchpin, INPUT);
}

void loop()
{
  currentButton = digitalRead(switchpin);
  if (currentButton == HIGH && lastbutton == LOW)
  {
    statechanged = true;
    lastbutton = HIGH;
  }
  else
  {
    lastbutton = currentButton;  // calling digitalRead() like could have a problem if the pin's state changed since you last checked
  }


  digitalWrite(ledpin, HIGH);
  delay(delaytime);
  digitalWrite(ledpin, LOW);
  delay(delaytime);

  if  ( statechanged == true && delaytime > 10)
  {
    delaytime = delaytime - 499;
  }
  else
  {
    delaytime = 2000;
  }
}