[REBOL] Re: [append][series]Appending to a series of strings
From: joel::neely::fedex::com at: 18-Nov-2003 7:19
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-
