ESP32 - Button - Debounce

const int BUTTON_PIN = 2;                                          // the number of the pushbutton pin
int lastState = LOW;                                               // the previous state from the input pin
int currentState;                                                  // the current reading from the input pin
void setup() {
    Serial.begin(9600);                                            // initialize serial communication at 9600 bits per second
    pinMode(BUTTON_PIN, INPUT_PULLUP);                             // initialize the pushbutton pin as an pull-up input
}                                               
void loop() {
   currentState = digitalRead(BUTTON_PIN);                         // read the state of the switch/button
   if(lastState == HIGH && currentState == LOW)                    // check if the pushbutton is pressed. 
       Serial.println("The button is released");             
   else if(lastState == LOW && currentState == HIGH)
       Serial.println("The button is pressed");              
   }
   lastState = currentState;                                       // save the the last state
}                

const int BUTTON_PIN = 2;                                      // GIOP21 pin connected to button
const int DEBOUNCE_DELAY = 50;                                 // the debounce time; increase if the output flickers
int lastSteadyState = LOW;                                     // the previous steady state from the input pin
int lastFlickerableState = LOW;                                // the previous flickerable state from the input pin
int currentState;                                              // the current reading from the input pin
       // the following variables are unsigned longs because the time, measured in
       // milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;                            // the last time the output pin was toggled
void setup() {
   Serial.begin(9600);                                         // initialize serial communication at 9600 bits per second:
   pinMode(BUTTON_PIN, INPUT_PULLUP);                          // initialize the pushbutton pin as an pull-up input
}
void loop() {
   currentState = digitalRead(BUTTON_PIN);                     // read the state of the switch/button:
       // check to see if you just pressed the button
       // (i.e. the input went from LOW to HIGH), and you've waited long enough
       // since the last press to ignore any noise:
   if (currentState != lastFlickerableState) {                 // If the switch/button changed, due to noise or pressing:                                               // the previous state from the input pin
       lastDebounceTime = millis();                            // reset the debouncing timer
       lastFlickerableState = currentState;                    // save the the last flickerable state
   }
   if ((millis() - lastDebounceTime) > DEBOUNCE_DELAY) {
       // whatever the reading is at, it's been there for longer than the debounce                                               
       // delay, so take it as the actual current state:
       // if the button state has changed:
       if(lastSteadyState == HIGH && currentState == LOW)
       Serial.println("The button is pressed");
       else if(lastSteadyState == LOW && currentState == HIGH)
       Serial.println("The button is released");
       lastSteadyState = currentState;                         // save the the last steady state
   }
}