# cmabrigde.rb - rane 21.6.2006
# ---
# http://www.mrc-cbu.cam.ac.uk/~mattd/Cmabrigde/
# Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy,
# it deosn't mttaer in waht oredr the ltteers in a wrod are,
# the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae.
# The rset can be a toatl mses and you can sitll raed it wouthit porbelm.
# Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef,
# but the wrod as a wlohe.

class String
  def cmabrigde
    output_arr = Array.new
    input_arr = self.split(' ') # "According to a researcher ... " -> ["According", "to", "a", "researcher", ... ]
    input_arr.each do |word| 
      original = word.split(//) # original => ["A", "c", "c", "o", "r", "d", "i", "n", "g"]
      scrambled = []
      scrambled.push(original.shift) # scrambled => ["A"]
      (0..original.length-2).each do # we want amount of the elements in the array WITHOUT the last letter which will remain in it's place
        scrambled.push(original.delete_at(rand(original.length-2))) # push-delete random element from original array to the scrambled one 
      end
      scrambled.push(original[0]) # original => ["g"] - only g left, as expected
      output_arr.push(scrambled.join) # output_arr => ["Adcricong", .. ] | scrambled => ["A", "d", "c", "r", "i", "c", "o", "n", "g"]
    end
    output_arr.join(" ") # returns the scrambled string - output_arr => ["Adcricong", "to", "a", "rrsecaheer", .. ]
  end
end

str = "According to a researcher at Cambridge University"
str.cmabrigde # => "Adcricong to a rrsecaheer at Cimbdarge Usriievnty"