8 input. 8 Ouput Switch

Using Arduino LEDs and Multiplexing
4

Well, as you sound like you are willing to learn to understand the code given to you, and it's only a few lines anyway, I'll get you started.

const byte inPins[8] = {2, 3, 4, 5, 6, 7, 8, 9};
const byte outPins[8] = {10, 11, 12, 13, 14, 15, 16, 17};

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(inPins[i], INPUT_PULLUP);
    pinMode(outPins[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < 8; i++) {
    if (digitalRead(inPins[i]) == LOW) {
      digitalWrite(outPins[i], HIGH);
      delay(500);
      digitalWrite(outPins[i], LOW);
    }
  }
}