From: Eric Hodel <drbrain@...7.net>
Date: 2005-02-05T08:05:58+09:00
Subject: Re: iteration the ruby way

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On 04 Feb 2005, at 14:18, Navindra Umanee wrote:

> John Wilger <johnwilger@gmail.com> wrote:
>>> I have a question about The Ruby Way.  Pickaxe gives the following
>>> example for using iterators in Ruby:
>>>
>>> a = [ "a", "b", "c" ]
>>> a.each {|x| print x, " -- " }
>>>
>>> This outputs:
>>>
>>> a -- b -- c --
>>>
>>> But what if I want to print "a -- b -- c"?  What's the proper Ruby 
>>> way
>>> of doing that?
>>
>> a = ["a","b","c"]
>> puts a.join(' - ')
>
> I guess I over-simplified.  I really want to do computations based on
> each element and compute my output.  However, it's slightly different
> for the last element.  I would like to detect the last element in the
> iteration.
>
> For example:
>
>      bottom_items.each{ |item|
>         do_something_with(item[0], item[1], item[2])
> 	if_not_last_item_do_this
>      }

items = items.map do |item|
   do_something_with item
end

puts items.join(' -- ')


-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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