Ruby - do_you_speak_retsec.txt

switch the first half of a word with the second half (‘half’ => ‘lfha’)
if the word.length == odd, leave the middle character in the same place.


- - - My Solution - - -

def reverse_by_center(s) 
  newArr=[]
  newArr << s[-(s.length/2)..-1]  #selects last half
  if s.length.odd?
    newArr << s[s.length/2]
  end
  newArr << s[0..(s.length/2)-1]  #selects first half
  newArr.join
end




- - - - - alt - - - - -

def reverse_by_center(s) 
  half = s.size/2
  [ s[-half..-1], s[half...-half], s[0...half] ].join
end

//this solution is elegant because it is able to accomplish all of this inline and without creating a new array. 
//it is functionally similar to my solution, but a bit simpler.

- - - - - alt - - - - -

def reverse_by_center(s) 
  if s.length.even?
    s.chars.rotate(s.length/2).join
  else
    s = s.chars
    s.insert(0, s.delete_at(s.length/2)).rotate(s.length/2 + 1).join
  end
end


// rotate is an interesting method worth understanding.
// rotate method affects arrays and puts the first numbers onto the end.
//   [1,2,3,4,5].rotate => [2,3,4,5,1]
//   [1,2,3,4,5].rotate(3) => [4,5,1,2,3]