A question about variables

Comments

• ar2rsawseen Maintainer

  March 2016

  local myVar = something

  would be removed once you exit the scope, which usually is a function

  self.myVar = something

  would be removed once whole class/object is garbage collected
  
  So it depends on how long you need your value to live

  Likes: antix, Ninjadoodle

  http://appcodingeasy.com/Gideros-Mobile

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• Ninjadoodle Member

  March 2016 edited March 2016

  Hi @ar2rsawseen
  
  Thank you for the explanation
  
  So, if Im setting up some variables inside the scenes init function ...

  Level1 = gideros.class(Sprite) function Level1:init()   local myVar1 = something self.myVar2 = something

  ... would both of these get removed at the same time when the scene is exited (or changed to another scene)?
  
  Thank you again!

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• antix Member

  March 2016 edited March 2016

  I am not sure but I think no. In all my classes I have a custom function that attempts to cleanup any variables and resources like so..

  SomeClass = Core.class()   function SomeClass.init() self.var1 = 1 self.var2 = 2 end   function SomeClass:doSomething() math.random() end   function SomeClass:dispose() self.var1 = nil self.var2 = nil end   local someThing = SomeClass.new() -- MAKE A NEW OBJECT someThing:doSomething() -- USE IT TO DO STUFF someThing:dispose() -- DISPOSE OF IT someThing = nil -- AFTER THIS IT SHOULD GET GARBAGE COLLECTED

  In theory at the end of my example the class should be disposed and be ready for garbage collection.
  
  Personally I think that's the best way, but somebody might have a better one.

  Likes: Ninjadoodle

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• ar2rsawseen Maintainer

  March 2016 Accepted Answer

  local myVar1

  would be accessible only in init function and should be garbage collected automatically when exiting init function

  self.myVar1

  would be accessible in any method of this class and should be garbage collected automatically when class gets garbage collected.
  
  Here is more info on garbage collection with real example including global variable
  http://www.giderosmobile.com/forum/discussion/comment/9441#Comment_9441
  

  http://appcodingeasy.com/Gideros-Mobile

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• Ninjadoodle Member

  March 2016 edited March 2016

  Hi @antix and @ar2rsawseen
  
  Thank you again for the explanation and links, it really helps clarify things

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