Arduino and Shift register

In this project you can see to control led using arduino and shift register.
For this project you need :
Arduino
Shift register 74hc595
Led
to see how work :
https://www.youtube.com/watch?v=F1K3qt9nhKc

code:
int latchPin = 3;
int clockPin = 4;
int dataPin = 2;
byte leds = 0;
int currentLED = 0;

void setup()
{
    pinMode(latchPin, OUTPUT);
    pinMode(dataPin, OUTPUT);
    pinMode(clockPin, OUTPUT);




leds = 0;
}

void loop()
{
    leds = 0;

    if (currentLED == 7)
    {
        currentLED = 0;
    }
    else
    {
        currentLED++;
    }

    bitSet(leds, currentLED);

    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, leds);
    digitalWrite(latchPin, HIGH);

    delay(250);
}