Concurrent blinkind LEDs using millis()

ConcurrentBlinkingLEDs.ino

//answering a question from StackExchange: 
//https://arduino.stackexchange.com/questions/53976/too-few-arguments-for-multiple-if-statement-conditions/53979#53979
// Blue LED blinks
// Red LED should go on if Blue LED is ON and switch/button is in correct posistion
// Concurrent LED blinking code from here: https://learn.adafruit.com/multi-tasking-the-arduino-part-1/using-millis-for-timing

int redLEDPin = 7;
int blueLEDPin = 3;
int redLEDtiming = 250;
int blueLEDtiming = 2000;
int leverR=2;

long previousMillisBlue = 0;
long previousMillisRed = 0;
bool ledStateBlue = LOW;
bool ledStateRed = LOW;

void setup() {
    pinMode(redLEDPin, OUTPUT);
    pinMode(blueLEDPin, OUTPUT);
    pinMode(leverR, INPUT_PULLUP);
}

void loop() {  
    unsigned long currentMillis = millis();

    if(currentMillis - previousMillisBlue > blueLEDtiming) 
    {
      previousMillisBlue = currentMillis;

      ledStateBlue = !ledStateBlue;

      digitalWrite(blueLEDPin, ledStateBlue);
    }

    //only blink Red LED if Blue LED is also on
    if(digitalRead(leverR) == HIGH && ledStateBlue)
    {
      if(currentMillis - previousMillisRed > redLEDtiming) 
      {
        previousMillisRed = currentMillis;

        ledStateRed = !ledStateRed;

        digitalWrite(redLEDPin, ledStateRed);
      }
    }
    else
    {digitalWrite(redLEDPin, LOW);}

}