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

== Function ==
=== Synopsis ===
<source lang="lua">
love.update( dt )
</source>
=== Arguments ===
{{param|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.
<source lang="lua">
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
</source>
Change a variable ''var'' at a constant rate (+/- 3 per second in this example).
<source lang="lua">
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
</source>
== See Also ==
* [[parent::love]]
* [[World:update]]
* [[variable]]
[[Category:Callbacks]]
{{#set:Description=Callback function used to update the state of the game every frame.}}
{{#set:Subcategory=General}}
{{#set:Since=000}}
== Other Languages ==
{{i18n|love.update}}