From: Edwin Fine <efine145-nospam01@...>
Date: 2006-11-22T02:34:01+09:00
Subject: Re: array question

Li Chen wrote:
> Thank you all for your invalulabe inputs.
> 
> Based on what I understand and my personal preference I choose the 
> following scripts.
> 
> 
> Li
> 
> ####
> array=[1,2,3,4,5]
> 
> array_new=Array.new
> array.each {|e| array_new<<[e,e]}
> 
> array_new.flatten![1..-2].each{|e| print "#{e}\t" }
> 
> puts
> 
> ##output
>>ruby sur3.rb
> 1	2	2	3	3	4	4	5
>>Exit code: 0

This is the best I could come up with. It works with any kind of element 
including embedded arrays.

array_new = (temp = array[1..-2]).zip(temp).inject([]){|n, e| 
n.concat(e) }

irb(main):148:0> array=[1,[2,3],4,5,{6,7},"8"]
=> [1, [2, 3], 4, 5, {6=>7}, "8"]
irb(main):149:0> (temp = array[1..-2])
=> [[2, 3], 4, 5, {6=>7}]
irb(main):150:0> (temp = array[1..-2]).zip(temp)
=> [[[2, 3], [2, 3]], [4, 4], [5, 5], [{6=>7}, {6=>7}]]
irb(main):151:0> (temp = array[1..-2]).zip(temp).inject([]) {|new, elem| 
new.concat(elem) }
=> [[2, 3], [2, 3], 4, 4, 5, 5, {6=>7}, {6=>7}]

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