A simple palindrome matcher.

palindrome.rb

def palindrome?(x)
  x = x.to_s

  if x.length == 1
    return true
  elsif (x.length % 2) == 0
    a = x[0..(x.length / 2 - 1)]
    b = x[(x.length / 2)..(x.length)].reverse
  else
    x = x.split('')
    a = x.shift(x.length / 2)
    b = x.pop(x.length - 1).reverse
  end

  a == b
end

palindrome?('w')       # => true
palindrome?('wow')     # => true
palindrome?('woow')    # => true
palindrome?('foobar')  # => false