From: "Peña, Botp" <botp@...>
Date: 2006-11-21T19:58:01+09:00
Subject: Re: array question

On_Behalf_Of_Li_Chen:
# I run  array=[1,2,3,4,5]
#        new_array = array.dup
#        new_array.shift
#        new_array.pop
# I get [2,3,4] but I want this result  [1,2,2,3,3,4,4,5]

but you can build from there. you just have to assemble it back, something like,

irb(main):031:0> array=[1,2,3,4,5]
=> [1, 2, 3, 4, 5]
irb(main):032:0> new_array = array.dup
=> [1, 2, 3, 4, 5]
irb(main):035:0> first = new_array.shift
=> 1
irb(main):036:0> last = new_array.pop
=> 5
irb(main):037:0> new_array
=> [2, 3, 4]
irb(main):038:0> new_array.map{|e| [e,e]}.flatten
=> [2, 2, 3, 3, 4, 4]
irb(main):039:0> new_array.map{|e| [e,e]}.flatten.unshift(first)
=> [1, 2, 2, 3, 3, 4, 4]
irb(main):040:0> new_array.map{|e| [e,e]}. flatten. unshift(first). push(last)
=> [1, 2, 2, 3, 3, 4, 4, 5]
irb(main):041:0>

kind regards -botp

# Li