Reverse a string in Ruby

Question

How do you reverse a string in Ruby? I know about string#reverse. I\'m interested in understanding how to write it in pure Ruby, preferably an in-place solution.

Answer 1

def reverse(string)
  result = ""
  idx = string.length - 1
  while idx >= 0
  result << string [idx]
  idx = idx - 1
 end

 result

end