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# love.update

Callback function used to update the state of the game every frame.

## Function

### Synopsis

love.update( dt )

### Arguments

`number dt`
  Time since the last update in seconds.

### Returns

Nothing.

## Examples

Run a function called think inside a table called npc once per second.

dtotal = 0 -- this keeps track of how much time has passed
function love.update(dt)
dtotal = dtotal + dt -- we add the time passed since the last update, probably a very small number like 0.01
if dtotal >= 1 then
dtotal = dtotal - 1 -- reduce our timer by a second, but don't discard the change... what if our framerate is 2/3 of a second?
npc.think()
end
end

Change a variable var at a constant rate (+/- 3 per second in this example).

var = 10 -- arbitrary starting value
rate = 3 -- change to change the rate at which the var is changed
function love.update(dt)
if love.keyboard.isDown("down") then -- reduce the value
var = var - (dt * rate)
end
if love.keyboard.isDown("up") then -- increase the value
var = var + (dt * rate)
end
end

## See Also

- love
- World:update
- variable

## Other Languages

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More info

Retrieved from "https://www.love2d.org/wiki/love.update"
Categories: Templates | Callbacks

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