[REBOL] Re: Block/array manipulation
From: carl:cybercraft at: 16-Oct-2001 8:54
On 16-Oct-01, Mat Bettinson wrote:
> Folks,
> Here's a simple thing which I've needed to do quite a bit of, but
> couldn't quite figure out how you'd do it in Rebol so tended to do
> things the long way.
> Let's take a block of stuff;
> Stuff: make block! ["fire" "water" "air" "water" "water" "air"]
> Now the object of the excersize is to to build block with all of the
> unique values. That bit is easy;
> foundstuff: make block! []
> foreach bitofstuff stuff [
> if found? find foundstuff bitofstuff [
> append foundstuff bitofstuff
> ]
> ]
Hmmm. A quick test of that didn't work for me. However, there's a
word to do that. It's called 'unique. (: ...
>> unique stuff
== ["fire" "water" "air"]
> After this, all of the unique values are loaded into the
> 'foundstuff' block.
> The question is, say I wanted to do this but count each instance of
> the words as they are subsequently found? IE I could somehow tell
> that water was found 3 times and air was found twice.
> This is where my rudimentary grasp of Rebol fails me. :)
Check out the related words to 'unique in the Core Guide. 'difference
and such. A mix of them might give you what you want. (Sory -
running late for work at the moment. :)
> Regards,
> Mat Bettinson
> Codeplay
> Tel: +44 (0)20 7482 3382
> 140-142 Kentish Town Rd, London, NW1 9QB
> http://www.codeplay.com
--
Carl Read
