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

A simple classic way with n/2 complexity

str = "Hello World!";
puts str;

for i in 0..(str.length/2).to_i
  mid = (str.length-1-i);
  temp = str[i];
  str[i] = str[aa];
  str[aa] = temp;
end

puts str;