From: James Edward Gray II <james@...>
Date: 2005-09-02T00:22:17+09:00
Subject: Re: palindrome finder

On Sep 1, 2005, at 10:06 AM, Josh Charles wrote:

> I've been working on this piece of code and it's starting to drive me
> crazy.

No worries, it's a simple mistake with an easy fix.

The Problem:

Each line read has a "\n" at the end of it, which is making your test  
fail, because "wow\n" does equal "\nwow".

The fix:

Strip the newline, like so

> Here is my code:
>
> file = File.open("testdict.txt", "r" ) do |file|
>     file.each_line("\n") do |line|
>         #filelist.push( line )

           line.strip!    # removes all whitespace at the front and  
back of the line

>         line.downcase!
>         if (line == line.reverse)
>             puts line
>         end
>     end
> end

Just FYI, you can also simplify the above a little.  Here's an example:

Neo:~$ cat testdict.txt
nothing
wow
Neo:~$ cat palidrome.rb
ARGF.each_line do |line|
         line.strip!
         line.downcase!

         puts line if line == line.reverse
end
Neo:~$ ruby palidrome.rb testdict.txt
wow

Hope that helps.

James Edward Gray II