Blink led series Using Arduino with full code

In this vedio I am giving a small example of led project using Arduino Here I am giving the code of my project.
int LED1 = 13;
int LED2 = 12;
int LED3 = 11;
int LED4 = 10;

void setup()
{ pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(LED4, OUTPUT);


}
void loop()
{
digitalWrite(LED1, HIGH);
delay(100);
digitalWrite(LED2, HIGH);
delay(200);
digitalWrite(LED3, HIGH);
delay(300);
digitalWrite(LED4, HIGH);
delay(400);
digitalWrite(LED1, LOW);
delay(100);
digitalWrite(LED2, LOW);
delay(200);
digitalWrite(LED3, LOW);
delay(300);
digitalWrite(LED4, LOW);
delay(400);

}

[kuntalmandal]

Hey Pabitra! Eta valo vabe baniye explain korechis.. Khub e valo hoyeche.. Tobe toke ekta kotha bolte chai, code ta k ek2 compress kor. Onek lengthy code hochhe.. "int i" method apply kor. Joto besi line er code korbi, totoi extra bit space khabe.