How to reverse a string in ruby

You can do this:

 def my_reverse(str)
  str.chars.inject {|a, b| b + a}
 end


 > my_reverse("idol")
 => "lodi"

You can also monkey patch the String object:

 class String
   def my_reverse
     self.chars.inject {|a, b| b + a}
   end
 end

 > "idol".my_reverse
 => "lodi"

and will print the same result :)

Warning: Be extra careful on monkey patching ruby objects.