Pushbutton start / stop LED blinking

/*
Example to use a pushbutton to start or stop a blinking LED, using millis()
More at : http://www.baldengineer.com/pushbutton-and-flashing-led-tutorial-with-millis.html
by: [email protected]
*/
const byte button=2;
const byte LED=10;

bool blinking = false;  //defines when blinking should occur
unsigned long blinkInterval = 250;  // number of milliseconds for blink
unsigned long currentMillis; // variables to track millis()
unsigned long previousMillis;

void setup() {
  pinMode(button, INPUT);
  pinMode(LED, OUTPUT);
}

void loop() {
  // this code blinks the LED
  if (blinking) {
    currentMillis = millis();  // better to store in variable, for less jitter
    if ((unsigned long)(currentMillis - previousMillis) >= blinkInterval) {  // enough time passed yet?
      digitalWrite(LED, !digitalRead(LED));  // shortcut to toggle the LED
      previousMillis = currentMillis;  // sets the time we wait "from"
    }
  } else {
    digitalWrite(LED, LOW); // force LED off when not blinking
  }
  int reading = digitalRead(button);
  delay(50); // crude de-bouncing

  if (reading==LOW) // buttons with pull-up are pressed when LOW
    blinking=true; // start blinking
  else
    blinking=false; // stop blinking
}