On change?

[Jackthemaster]

Is there somehow to determine if a value changes? Something like this:
if Time == 1 then
add = add + 1
elseif Time == 2 then
add = add + 1
...
etc etc

[Lexic]

[lua]local lastvalue;
local function doSomethingIfItsChanged(value)
if (value ~= lastvalue) then
lastvalue = value;
-- do something
end
end

doSomethingIfItsChanged(5) -- does something
doSomethingIfItsChanged(5) -- doesnt'
doSomethingIfItsChanged(6) -- does
doSomethingIfItsChanged(5) -- does
doSomethingIfItsChanged(5) -- doesn't[/lua]

[Jackthemaster]

Thanks