[REBOL] Re: Help
From: henrikmk:gmai:l at: 9-Sep-2010 19:46
On Thu, Sep 9, 2010 at 7:38 PM, Emeka <emekamicro-gmail.com> wrote:
> Hello All,
>
> Which word would I use for something like this? I have a block [ A B C D] ,
> I would like to do
> Ismember? [A B C D] D comes true because D is in the block already , =A0but
> Ismember?{A B C D] F comes false.
Simply use FIND:
find [a b c d] 'd
== [d]
FIND returns the block at the index of the found item. If not found,
it returns NONE.
This is nice and simple, because it interacts directly with IF or EITHER:
either find [a b c d] 'd [
print "member found"
][
print "member not found"
]
Depending on the content of the block, you may need to use FIND/ONLY
If you really want logic! output, you can add a FOUND?:
found? find [a b c d] 'd
== true
--
Regards,
Henrik Mikael Kristensen
