[REBOL] Re: Block/array manipulation
From: chris:ross-gill at: 15-Oct-2001 18:45
Hi Mat & Carl,
> 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"]
Knew there was a more suitable word than 'union.
Anyway, had a go refining the function. This one is better because:
o It uses less words.
o It works with blocks that include integers. Which itself is interesting -
Try this at the console:
x: [1]
x: block-stats x ; keep repeating this line
Try starting 'x at [1 2] or [1 2 3]. They all come to the same conclusion.
(well, I found it interesting :o)
- Chris
--
REBOL []
block-stats: func [
in-blk [block!]
/local num num-blk out-blk
][
out-blk: unique in-blk
num-blk: copy []
loop length? out-blk [append num-blk 0]
foreach item in-blk [
num: index? find out-blk item
change back skip num-blk num num-blk/:num + 1
]
while [not tail? out-blk][
insert next out-blk first num-blk
out-blk: skip out-blk 2
num-blk: next num-blk
]
head out-blk
]
