Trying to solve a challenge given to me yesterday to write a script that tests for palindromes on strings with unknown length and no special characters (alphanumeric only)

palindrome.rb

#!/bin/ruby

# I want to make this a class, but until I get all the 
# bugs worked out it will just be a script :-)
#class Palindrome

  def isPalindrome(string)
    palindrome = true
    reverse = string.reverse

    limit = string.length % 2 == 0 ? string.length / 2 : string.length / 2 + 1
    for i in 0...limit
      palindrome = string[i] == reverse[i]
      return false if !palindrome # don't bother to continue if we hit a failed case
    end

    return palindrome
  end

  # Discover palindromes from a string
  def discover(string)
    @palindromes = []

    # Do a palindrome check on each index, b/c there may be
    # more than one paleindrome overlapping one another
    for i in 0...string.length
      # Now find palindromes from this index forward (smallest possible case is three characters)
      for j in 3...string[i...string.length].length + 1
        # Create a substring to test if it's a palindrome
        palindrome = string[i...i+j]

        # Add the palindrome to the instance variable if a palindrome is found
        @palindromes.push(palindrome) if isPalindrome(palindrome)
      end
    end

    # Print palidromes found
    puts @palindromes
  end

#end

discover("ababcba") # There should be 4 palindromes found from this string ("aba", "bab", "abcba", "bcb")

Putting this on hold to get back to work :-) It's the end of my lunch break.