Run Void *** when button is pressed

Using Arduino Programming Questions
8

In fact this code is made from two other scripts. I have cut and pasted bits to try and get it working without really understanding whats going on.

I agree with your suggestion. I had started already. I setup a breadboard with a button and led and got the code to switch the led on/off. This works well. What I would need from this is to learn how to change the command from ledPin command to running void pattern() or void pong()

heres the button code:

int switchPin = 7;
int ledPin = 13;

boolean lastButton = LOW;
boolean currentButton = LOW;
boolean ledOn = false;

void setup()
{
  pinMode(switchPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

boolean debounce(boolean last)
{
  boolean current = digitalRead(switchPin);
  if (last != current)
  {
    delay(5);
    current = digitalRead(switchPin);
  }
  return current;
}

void loop()
{
  currentButton = debounce(lastButton);
  if (lastButton == LOW && currentButton == HIGH)
  {
    ledOn = !ledOn;
}

     lastButton = currentButton;
  digitalWrite(ledPin, ledOn);
}

Say I wanted to have this in the button code above,

void flashslow() {
  digitalWrite(ledPin, HIGH);   
  delay(2000);             
  digitalWrite(ledPin, LOW);   
  delay(2000);            
}

void flashfast() {
  digitalWrite(ledPin, HIGH);   
  delay(100);               
  digitalWrite(ledPin, LOW);   
  delay(100);             
}

Instead of the button code turning on/off the led, how would i get it to switch between the two codes above? If I could figure this out Im sure I can get my pong code working.