From: Sean Ob <sob4ever33@...>
Date: 2009-11-19T05:05:50+09:00
Subject: Re: Ruby/tk Help Please

i have read a lot of things pertaining to blocks, but i still don't
> understand them.

 Then keep reading and practicing.  There is no shortcut.
> for example i have tried several variations of
> 
> result*@list2.each + '\n'
> #i realize this is horrible syntax, but what i want to do is take result 
> and then print the result*each element of list2 on separate lines

 It's incorrect syntax.  Think of it this way:

 In English, you're saying "I want to do something with each element of
 @list2."
 In Ruby, that's
 @list2.each do |element|
   something
 end

 The each method takes each element in turn and calls the block with 
that
 element.

 Now, what's the "something" you want to do with each element?  You want
 to multiply each element by result, convert the result to a string, and
 append \n.  In Ruby, that's
 (element * result).to_s + "\n"

 Putting those constructs together, we get
 @list2.each do |element|
   (element * result).to_s + "\n"
 end

 Does that make more sense?

 In fact, I probably wouldn't write it like this.  I'd probably do
 @list2.collect {|e| e * result}.join "\n"

 The output is slightly different, but it's probably what you want.

 Determining why this works (and the difference in output) is left as an
 exercise to the student. :)


 [...]
>> i realize my method of just jumping into a language trying to do complex 
>> things right away is not a very logical approach however i learn best by 
>> doing and by example.
> 
 So do I.  Just make sure you learn your prerequisites.
> 
>>>There are probably people reading this and laughing at my lack of
>>>programming knowledge, but this here is a perfect example of the type of
>>>explanations i am looking for.  Thank you, i very much appreciate your
>>>ability to communicate these concepts to me.
-- 
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