Button + LED blink with Arduino Nano

buttonLEDBlink.ino

#define buttonPin 4
#define extLEDPin 8

void setup(){
  Serial.begin(9600);
  Serial.println("--- Hello :) ---");
  pinMode(buttonPin, INPUT);
  pinMode(extLEDPin, OUTPUT);
}

void loop() {
  if (digitalRead(buttonPin) == HIGH) {
    Serial.println("LED BLINK");
    digitalWrite(extLEDPin, HIGH);
    delay(200);
    digitalWrite(extLEDPin, LOW);
    delay(200);
  } else {
    Serial.println("LED OFF");
    digitalWrite(extLEDPin, LOW);    
  }
}