From: dblack@...
Date: 2006-11-21T13:46:52+09:00
Subject: Re: array question

Hi --

On Tue, 21 Nov 2006, Wilson Bilkovich wrote:

> On 11/20/06, Li Chen <chen_li3@yahoo.com> wrote:
>> Hi all,
>> 
>> I want to build a new array from an old one with every element being
>> duplicated except the first and last element. And here are my codes. I
>> wonder if this is a real Ruby way to do it.
>> 
>
> A couple of ways: (there are probably dozens more)
> # given:
> array = [1,2,3,4,5,6]
>
> # 1.
> new_array = array[1..-2]
>
> # 2.
> new_array = array.dup
> new_array.shift # shifts off the first element
> new_array.pop # pops off the last element

I think Li wanted to duplicate elements in the sense of:

   [1,2,3,4,5]  =>  [1,2,2,3,3,4,4,5]


David

-- 
                   David A. Black | dblack@rubypal.com
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org