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    Object and parameter passing

    CyberienceCyberience Member
    edited February 2013 in General questions
    Ok, somthing simple, language based. I have an object, with self.x and self.y inside.
    I dont want to add them as paramters to the nitialisation, but can I pass the values at the initialisation stage?
    like this?

    MovieSprite.new("explode1",25,1,0,{x=100,y=100})

    Now this doesn't work, so is there a way? or do I just create the parameters and ignore them if not used?
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    Comments

    • zvardinzvardin Member
      Accepted Answer
      No, you could either create parameters (or one table parameter and handle it) or add it to the object after.
      function MovieSprite:init(str,x,y,z,attributes)
   for k,v in pairs(attributes) do
      self[k] = v
   end
end
      The best approach really depends on what you're trying to accomplish though. There is also a special param you can use "..." to mean a variable number of parameters. http://www.lua.org/pil/5.2.html

      Likes: Cyberience

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    • techdojotechdojo Guru
      Accepted Answer
      @zvardin's approach is correct, just use one of your :init() parameters as a table and you can then pass in as little or as much as you like.

      You can then use code like
      function MovieSprite:init(str,x,y,z,attributes)
   attributes = attributes or {}
   local ax = attributes.x or "some default value"
   local ay = attributes.y or "some default value"
    ...
    ...
    ...
 
end
      To automatically check (and adapt to) any parameters not being specified either via the function call OR the supplied attribute table.

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