Text-related activities: reverse text and swap in place

text.rb

module Bigaqua
  module Text
    def reverse_text(input)
      arr = []
      i = input.length - 1
      while i >= 0 do
        arr.push(input[i])
        i -= 1
      end
      arr.join("")
    end
    
    def swap_in_place(input)
      length = input.length
      mid = (length / 2) - 1
      for i in (0..mid)
        tmp = input[i]
        input[i] = input[-i-1]
        input[-i-1] = tmp
      end
      input
    end
  end
end