Cant understand this Why is there a last in Boolean debugging(Boolean last)

Using Arduino Programming Questions
1

int switchPin = 8;
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);

}

How can the last be compared if there is no value assigned to it in the command

If(last!=current)
{
}

2

How can the last be compared if there is no value assigned to it in the command

The value of last comes from the value passed into the function

3

Could you please it to me UK heli Bob thank you

4

boolean debounce(boolean last)
{
boolean current = digitalRead(switchPin);
if (last != current)

It's a parameter of the function call. If you don't get that, read about functions :slight_smile:

5

Sorry septillion I am new to the forums I joined today I did not know about code tags I will use the form now thank you