From: Gary Yngve <gary.yngve@...>
Date: 2009-05-09T09:19:04+09:00
Subject: Re: ruby string slice/[] w/ range, weird end behavior

On May 8, 4:47 pm, Eleanor McHugh <elea...@games-with-brains.com>
wrote:
> "foo"[3..3]                   => ""
...
> index [3] is actually the end of the string so whilst the range  
> accesses the string after any characters in it, it's still accessing  
> the string in a valid range.

Maybe in the native C.  But why should that be exposed?
And why shouldn't index[3] return "" if you are correct?

After all:

>> a=[]; "asd".each_byte{|x| a << x}; a
=> [97, 115, 100]

If I ask for a substring entirely out of bounds, I should consistently
be returned nil or "", not one of the two.