From: Stu <stu@...>
Date: 2011-04-22T17:43:07+09:00
Subject: Re: Reversing a string without using array, classes and reverse function

One more with ruby blocks (This would be the ruby way =) )

s = "1234567890"
r = String.new
s.length.times{|i| r << s[(i+1)*(-1)]}

r == s.reverse
true

cheers!!!

That was fun!!!... give me another =)

~Stu
On Fri, Apr 22, 2011 at 3:32 AM, Stu <stu@rubyprogrammer.net> wrote:
> On Fri, Apr 22, 2011 at 2:45 AM, Jose Calderon-Celis
> <josecalderoncelis@gmail.com> wrote:
>
>> for j in 1..len do
>>  mycommand += s[-1*j]
>>
>>
>
> very nice I like the use of your math. By multiplying the array index
> by negative one your sending the index a reverse number while your for
> loop traverses forward. This is perfect logic.
>
> Here is a rewrite with my while loop:
>
> s = "1234567890"
> r=String.new
> i = 1
> while i <= s.length
>  r << s[i*(-1)]
>  i+=1
> end
> printf s
> "0987654321"
>  => "0987654321"
>> y == x.reverse
> true
>