Shorten this code?

Projects Programming
1

what would be the easiest way to shorten this code?

    analogWrite(led1, 255);
    delay(300);
    analogWrite(led1, LOW);
    delay(300);
    analogWrite(led1, 255);
    delay(300);
    analogWrite(led1, LOW);
    delay(300);
    analogWrite(led1, 255);
    delay(300);
    analogWrite(led1, LOW);
    delay(300);
    analogWrite(led2, 255);
    delay(300);
    analogWrite(led2, LOW);
    delay(300);
    analogWrite(led2, 255);
    delay(300);
    analogWrite(led2, LOW);
    delay(300);
    analogWrite(led2, 255);
    delay(300);
    analogWrite(led2, LOW);
    delay(300);
    analogWrite(led3, 255);
    delay(300);
    analogWrite(led3, LOW);
    delay(300);
    analogWrite(led3, 255);
    delay(300);
    analogWrite(led3, LOW);
    delay(300);
    analogWrite(led3, 255);
    delay(300);
    analogWrite(led3, LOW);
    delay(300);
    analogWrite(led4, 255);
    delay(300);
    analogWrite(led4, LOW);
    delay(300);
    analogWrite(led4, 255);
    delay(300);
    analogWrite(led4, LOW);
    delay(300);
    analogWrite(led4, 255);
    delay(300);
    analogWrite(led4, LOW);
    delay(300);
    }
2

If it is an Arduino with an 8 bit resolution DAC ( e.g a Uno, Nano etc.), then analogWrite(pin, 255) is the same as digitalWrite( pin, HIGH ) and analogWrite(pin, LOW ) is the same as digitalWrite( pin, LOW ) ;

To shorten it, group all the statements for one led in a function with the led pin as parameter. Call the function four times, that is once for each led.