Function creating in Lua

Question

When I create the function by assigning ,"if" condition doesn't work but when I do create the function like in second example below, it works. Can you tell me why?

Not working:

local start=os.time()

local countDown = function(event)
   if((os.time()-start)==3) then
      Runtime: removeEventListener("enterFrame", countDown)
   end
   print(os.time()-start)
end

Runtime:addEventListener("enterFrame", countDown)

Working:

local start=os.time()

local function countDown(event)
   if((os.time()-start)==3) then
      Runtime: removeEventListener("enterFrame", countDown)
   end
   print(os.time()-start)
end

Runtime:addEventListener("enterFrame", countDown)

Nicol Bolas · Accepted Answer · 2013-06-08 12:04:46Z

12

That's because when you do local countDown = ..., the countDown variable doesn't exist until after the ... part has been executed. So your function will access a global variable, not the local one that doesn't exist yet.

Note that Lua converts local function countDown ... into the following:

local countDown
countDown = function ...

answered Jun 8, 2013 at 12:04

Nicol Bolas

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