Ir sensor programming

Coding to program ir sensor and aurdino
void setup()
{
pinMode(13,OUTPUT);
pinMode(3,INPUT);
Serial.begin(9600);
}
void loop()
{
if (digitalRead(3)== LOW)
{
digitalWrite(13,HIGH);
delay(10);
}
else
{
digitalWrite(13,LOW);
delay(10);
}
}

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