From: "David A. Black" <dblack@...>
Date: 2003-12-04T03:48:02+09:00
Subject: Re: strings and ranges

Hi --

On Thu, 4 Dec 2003 charlie.mills@milliman.com wrote:

> The following program doesn't execute as I would expect:
> 
> #!/usr/bin/ruby
> 
> stringy = "X"
> 
> 1.upto(10) do |i|
>   puts stringy
>   stringy.succ!
> end
> 
> "X".upto("AG") do |ss|
>   puts ss
> end
> 
> puts "'AB' > 'AA' = #{'AB' > 'AA'}"
> puts "'X' < 'AA' = #{'X' < 'AB'}"

Interesting -- just like "9" and "10" (i.e., "9" > "9".succ).  

> # The code below gets around my problem...
> 
> stringy = "X"
> while true
>   puts stringy
>   stringy.succ!
>   break if stringy == "AH"
> end
> 
> # Is there a better way?

How about this:

  x = "X"
  puts (0...10).map { x.succ! .dup }

(You need the .dup or you'll end up with 10 of x, all the same
string.)


David

-- 
David A. Black
dblack@wobblini.net