From: botp <botpena@...>
Date: 2011-10-17T13:38:47+09:00
Subject: Re: writing a poem backwards or in reverse order

On Mon, Oct 17, 2011 at 12:25 PM, teresa nuagen
<s-unguyen2@huskers.unl.edu> wrote:
> I'm struggling on how to approach the method using "string#split" I'm
> unsure of how to divide each line into words and iterating it from last
> word to first word, and then writing it in reverse order.

break down the problem into smaller ones.

eg,

s=<<-HERE
waiting for hours
wet at first, in the cold dark
just to be gulped down
HERE
#=> "waiting for hours\nwet at first, in the cold dark\njust to be
gulped down\n"

a1=s.split "\n"
#=> ["waiting for hours", "wet at first, in the cold dark", "just to
be gulped down"]

a2=a1.reverse
#=> ["just to be gulped down", "wet at first, in the cold dark",
"waiting for hours"]

a3=a2.map{|s| s.split.reverse.join(" ")}
#=> ["down gulped be to just", "dark cold the in first, at wet",
"hours for waiting"]

a4=a3.map{|s| s.split.map{|w| w.split(//).reverse.join}}
#=> [["nwod", "deplug", "eb", "ot", "tsuj"], ["krad", "dloc", "eht",
"ni", ",tsrif", "ta", "tew"], ["sruoh", "rof", "gnitiaw"]]

a4=a3.map{|s| s.split.map{|w| w.split(//).reverse.join}.join(" ")}
#=> ["nwod deplug eb ot tsuj", "krad dloc eht ni ,tsrif ta tew",
"sruoh rof gnitiaw"]

puts a4
nwod deplug eb ot tsuj
krad dloc eht ni ,tsrif ta tew
sruoh rof gnitiaw
#=> nil