[REBOL] Re: [append][series]Appending to a series of strings
From: seth:chromick:earthlink at: 18-Nov-2003 9:53
Joel Neely wrote:
>Hi Seth,
>
>See below...
>
>Seth wrote:
>
>> >> a: [1 2 3 4 5]
>>== [1 2 3 4 5]
>> >> b: [""]
>>== [""]
>> >> x: index? a
>>== 1
>> >> append b/:x "hi"
>>== "hi"
>>
>>
>
>At this point, take a look at the value of B to see why:
>
> >> b
>== ["hi"]
> >> fourth b
>** Script Error: Out of range or past end
>** Near: fourth b
> >>
> >> b/:x
>== none
> >>
>
>> >> x: index? find a 4
>>== 4
>>
>>
>
>At this point B has no fourth element (ergo B/:X returns NONE) so...
>
>> >> append b/:x "hi"
>>** Script Error: append expected series argument of type: series port
>>** Near: append b/:x "hi"
>>
>>In theory, shouldn't append do it's thing on b/4 ... What's with the
>>error? :\
>>
>>
>>
>
>...you can't treat that (non-existent) element as a series.
>
>Unlike Perl, which automatically allocates and meaningfully initializes
>previously non-existent data, REBOL requires that a value exist and be
>of the correct type for whatever operation you attempt to perform on it.
>
>-jn-
>
Thanks everyone... I was coming from a Perl point of view here -- The
REBOL way is a lot more logical -- This is what I get for coding at
ungodly hours in the morning ;] Thanks... :D
