[REBOL] Re: Essay on Associative Data Stores
From: g:santilli:tiscalinet:it at: 18-Sep-2000 19:21
Hello [joel--neely--fedex--com]!
On 16-Set-00, you wrote:
j>>> test-select: func [b [block!] k [any-type!] v
j> [any-type!]] [
j> [ append b reduce [k v]
j> [ select b k
j> [ ]
j>>> blk: []
j> == []
Try this:
>> test-select: func [b k v] [
[ append b reduce [k v]
[ select/only b k
[ ]
>> blk: []
== []
>> test-select blk "a" "b"
== "b"
>> test-select blk [2 3] 6
== 6
j>>> select blk reduce [[2 3]]
j> == 6
j> Now THAT was a surprise! I'll be glad to hear any explanations
j> anyone can offer for that last case! Whatever the explantion
REBOL functions tend to treat series as a sequence of values, not
as a single value. They have the /ONLY refinement to treat series
as a single value. You SELECT was serching for the value 2
followed by the value 3, not for the value [2 3].
Also notice that:
>> blk: [1 2 "one-two" 1 3 "one-three" 2 3 "two-three"]
== [1 2 "one-two" 1 3 "one-three" 2 3 "two-three"]
>> select blk [1 2]
== "one-two"
>> select blk [1 3]
== "one-three"
>> select blk [2 3]
== "two-three"
Regards,
Gabriele.
--
Gabriele Santilli <[giesse--writeme--com]> - Amigan - REBOL programmer
Amiga Group Italia sez. L'Aquila -- http://www.amyresource.it/AGI/
