Button Debouncing in Arduino

const int buttonPin = 8;
const int debounceInterval = 30;  // debounce time in milliseconds

unsigned long lastDebounceTime = 0;  // variable to store the last time the button state changed
bool currentButtonState = HIGH;             // variable to store the current button state
bool lastButtonState = HIGH;         // variable to store the last button state

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // set button pin as input with internal pull-up resistor
  Serial.begin(9600);                
}

void loop() {
  float reading = digitalRead(buttonPin);   // read the current state of the button

  if (reading != lastButtonState) {   // check if the button state has changed (from HIGH to LOW or LOW to HIGH)
    lastDebounceTime = millis();    // reset the debounce timer
  }

  if ((millis() - lastDebounceTime) > debounceInterval) {   // check if the debounce delay has been passed
  
    if (reading != currentButtonState) {   // update the button state
      currentButtonState = reading;

      if (currentButtonState == LOW) {       // check if the button is pressed (LOW state)
        Serial.println("BUTTON IS PRESSED");
        // take action accordingly
      } else {
        Serial.println("BUTTON NOT PRESSED");
        // take action accordingly
      }
    }
  }

  lastButtonState = reading;   // save the current state as the last state, for the next loop 
}