From: "David A. Black" <dblack@...>
Date: 2009-07-21T04:08:58+09:00
Subject: Re: getting char from string as fixnum in 1.8 and 1.9

Hi --

On Tue, 21 Jul 2009, Joel VanderWerf wrote:

>
> What's the best way to write this program so that it will run correctly on 
> both 1.8 and 1.9? This works, but I'm just curious if there's anything 
> better, preferably without the RUBY_VERSION test, without adding methods to 
> String, and without losing much efficiency compared with 1.8's String#[].
>
> if RUBY_VERSION =~ /\A1\.9/
>  def third_char_as_fixnum(s)
>    s[2].ord
>  end
> else
>  def third_char_as_fixnum(s)
>    s[2]
>  end
> end
>
> s = "abc"
> p third_char_as_fixnum(s) # ==> 99

I'm sure someone will have something more elegant but I'll get the
ball rolling with:

   def third_char_as_fixnum(s)
     s[2,1].unpack("C*")[0]
   end

It may not pass the not losing much efficiency test, though.


David

-- 
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