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Posted in Tutorials
October 25, 2014 at 12:39 AM
Beginner Lua Lesson 6: “return” and Callbacks
The word “return” is bold and dark blue, just like “function,” “end,” etc. What it does, essentially, allows you to retrieve anything from a separate function. You call upon the function, and in that function, add “return,” followed by what to send back to what called upon the function; these must be on the same line, spaced once.
function RetrieveAlivePlayers() local count = 0 for i, plyr in pairs(game.Players:GetPlayers()) do if plyr.PlayerIsAlive.Value then --Pretend this exists on the Player count = count + 1 end end return count end --Loop checks every 10 seconds how many Players are alive while true do local AlivePlayers = RetrieveAlivePlayers() print("There are currently "..AlivePlayers.." alive!") wait(10) end
A callback is the same as a function mostly. The only difference is how the two are fired. With a function, you use the connect method like you would an event. As for a callback, you instead use an “=” to make it seem as if you’re setting a value. However, this can essentially be the case. Callbacks are actually very rare. One of the only usages is RemoteFunction.
--[[The following Callback halts the game from shutting down until the Callback finishes after the last player has left. return is surprisingly not used. ]] game.OnClose = function() print("Waiting 5 seconds before shutting down...") wait(5) print("Done.") end