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On Sun, Nov 22, 2015 at 2:53 PM, Andreas Matthias
<> wrote:
> Display:new() -->  -->  self refers to Display
> dis1:getCount()  -->  dis1.getCount(dis1)  -->  self refers to dis1

Exactly. When you call a method with ":", the object on the left of
the colon becomes the first argument to the method, and thus the value
of the "self" argument.