From: Brian Candler <b.candler@...>
Date: 2011-12-12T01:32:28+09:00
Subject: Re: How can i make this procedure into a function?

Akvile K. wrote in post #1036147:
> what i need is that this procedure works in a programm that chsnges the
> lights in a traffic light. i am using timer now but i am 100% sure that
> my professor during the exam wants to see a function or a procedure in
> this programm.

If that's really the case then your professor doesn't know much about 
ruby. Ruby has neither procedures nor functions - it has methods. (You 
could count lambdas as being another type of callable too)

In some imperative languages, the only difference between a procedure 
and a function is whether it returns a value or not. So by that 
definition, a method in ruby will substitute for either.

Now, if you are going to define a method, I suggest you do it *outside* 
a block. e.g.

def mymethod(x,y,z)
  ...
end

Shoes.app do
  ... all this is a block
  mymethod(a,b,c)
  ... etc
end

This is because a block is essentially a bit of callback code, to be 
executed zero, one or more times by the method it is passed to 
(Shoes.app here). So if you use 'def' within a block, you may end up 
defining the same method lots of times.

-- 
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