Button + external LED with Arduino Nano

buttonExternalLED.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 HIGH");
    digitalWrite(extLEDPin, HIGH);    
  } else {
    Serial.println("LED LOW");
    digitalWrite(extLEDPin, LOW);
  }
}