Re: Why (substring "abc" 0 4) does not return "abc" instead of an error?

[Bastien]

Juanma Barranquero <address@hidden> writes:

> On Mon, Jul 16, 2012 at 1:15 AM, Bastien <address@hidden> wrote:
>
>> As the subject says: I wonder why
>>
>>   (substring "abc" 0 4)
>>
>> does not return "abc".
>
> Why should it? How it is different from (aref "abc" 4)?

I read (aref "abc" 4) as "return the 5th element of "abc"". 

So I expect an error here.

I read (substring "abc" 0 4) as "return the biggest substring
between 0 and 4" -- even if the string does not have 4 characters.

Surely I misread, but this would be handy in some cases, instead
of using something like (format "%.4s" "abc").

-- 
 Bastien