Strange "HEAD" behaviuor

[1/7] from: sharriff:aina:med-iq at: 8-Nov-2000 9:16

Given this snippet:

>> fileblock: read %./

== [%dictionary/ %rebol.exe %dictionary.html %notes.html %setup.html %map.r %rebdoc.r %rebol.r %user.r]

>> length? fileblock

== 9

>> forall fileblock [ print fileblock/1 ]

dictionary/ rebol.exe dictionary.html notes.html setup.html map.r rebdoc.r rebol.r user.r == false

>> tail? fileblock

== true

>> head fileblock

== [%dictionary/ %rebol.exe %dictionary.html %notes.html %setup.html %map.r %rebdoc.r %rebol.r %user.r]

>> length? fileblock

== 0

>> tail? fileblock

== true

Why does�nt "Head fileblock" work? Sharriff Aina med.iq information & quality in healthcare AG

[2/7] from: al:bri:xtra at: 8-Nov-2000 22:43

> >> tail? fileblock > == true > >> head fileblock > == [%dictionary/ %rebol.exe %dictionary.html %notes.html %setup.html

%map.r Try: fileblock: head fileblock as: tail? head fileblock will result in: true Andrew Martin ICQ: 26227169 http://members.nbci.com/AndrewMartin/

[3/7] from: al:bri:xtra at: 8-Nov-2000 22:50

> Try: > fileblock: head fileblock > as: > tail? head fileblock > will result in: > true

Uhm, actually, that should be: false Andrew Martin Red faced... ICQ: 26227169 http://members.nbci.com/AndrewMartin/

[4/7] from: sharriff::aina::med-iq::de at: 8-Nov-2000 9:56

I guessed as mich :-) don�t you think that its buggy logic from REBOL? I thought it would be logical to write " HEAD series" just as the the help docs states USAGE: HEAD series DESCRIPTION: Returns the series at its head. HEAD is an action value. ARGUMENTS: series -- (Type: series port)

your workaround works but that would mean I would need extra code to reset blocks when using "FORALL" (-sigh-) I�ll have to avoid using FORALL then.. Cheers Sharriff Aina med.iq information & quality in healthcare AG "Andrew Martin" An: <[rebol-list--rebol--com]> <[Al--Bri--xtra]. Kopie: co.nz> Thema: [REBOL] Re: Strange "HEAD" behaviuor Gesendet von: rebol-bounce@ rebol.com 08.11.00 22:50 Bitte antworten an rebol-list

> Try: > fileblock: head fileblock > as: > tail? head fileblock > will result in: > true

Uhm, actually, that should be: false Andrew Martin Red faced... ICQ: 26227169 http://members.nbci.com/AndrewMartin/

[5/7] from: petr:krenzelok:trz:cz at: 8-Nov-2000 11:14

[Sharriff--Aina--med-iq--de] wrote:

> I guessed as mich :-) don�t you think that its buggy logic from REBOL? I > thought it would be logical to write " HEAD series" just as the > the help docs states

It's not buggy and yet docs are all ok :-) Look - head is a function - it returns its value. If you don't assign the value to any word - it just returns its value to console :-) ->> head? ["a" "b" "c"] == true ->> head? tail ["a" "b" "c"] == false ->> head? head tail ["a" "b" "c"] == true here head? checks for the returned value .... Andrew is right, just reassign the value of word referring to series ... Cheers, -pekr-

[6/7] from: ingo:2b1 at: 8-Nov-2000 11:30

Hi Sharriff, you have to reassign the return value of head to a word fileblock: head fileblock regards, Ingo Once upon a time [Sharriff--Aina--med-iq--de] spoketh thus:

[7/7] from: sharriff:aina:med-iq at: 8-Nov-2000 11:27

Thanks Ingo! Sharriff Aina med.iq information & quality in healthcare AG Ingo Hohmann <[ingo--2b1--de]> An: [rebol-list--rebol--com] Gesendet von: Kopie: rebol-bounce@ Thema: [REBOL] Re: Strange "HEAD" behaviuor rebol.com 08.11.00 10:30 Bitte antworten an rebol-list Hi Sharriff, you have to reassign the return value of head to a word fileblock: head fileblock regards, Ingo Once upon a time [Sharriff--Aina--med-iq--de] spoketh thus: