[REBOL] Re: list length
From: carl:cybercraft at: 31-May-2001 15:32
On 30-May-01, Ammon Cooke wrote:
> Hi,
>
> I am trying to compare the length of two text-lists. This is the
> code I am using to get the length:
> lst1-len: lst1/text: to-integer length? lst1/data
> when the list has 20 items in it this code returns 2
> when the list has 8 it returns 8
> Thanks!!
> Ammon
You're almost there. As the list is a block it's index can move
which will be (I assume) the cause of the differing results you got
above. For instance...
>> view layout[a-list: text-list "aa" "bb" "cc" "dd"]
>> a-list/data
== ["aa" "bb" "cc" "dd"]
>> length? a-list/data
== 4
>> a-list/data: next a-list/data
== ["bb" "cc" "dd"]
>> length? a-list/data
== 3
All the data's still there though, as can be seen if we get the length
from the head of the list...
>> length? head a-list/data
== 4
So, just place 'head before your lst1/data and you should always get
the length of the full list.
--
Carl Read
[carl--cybercraft--co--nz]
