Debounce

const int button = 12;
const int led = 5;
boolean lastbutton = false;
boolean currentbutton = false;
boolean ledOn = false;

void setup()
{
  pinMode (button, INPUT);
  pinMode (led, OUTPUT);
  digitalWrite (led, HIGH);
  delay (5);
  Serial.begin (9600);

}
boolean debounce (boolean lastbutton)
{
  boolean currentbutton = digitalRead (button);
  if (lastbutton != currentbutton)//if lastbutton is different than currentbutton then delay for 5 milliseconds and read the currentbutton
  {
    delay (5);
    currentbutton = digitalRead (button);
  }
  return currentbutton;
}

void loop()
{
  currentbutton = debounce (lastbutton);//this makes the button act like a switch, so you don't have to keep your finger on the push button to turn on the LED
  if (currentbutton == true && lastbutton ==false)//if they are opposite
  {
    ledOn =! ledOn;//do the opposite of the LED therefore turning it on or off
  }
  digitalWrite (led, ledOn);
  lastbutton = currentbutton;//changed the lastbutton to match the currentbutton so if the currentbutton was false lastbutton will now turn to false
}