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Beginner Joined: 02 Nov 2002 Posts: 27 Location: USA

What I'm trying to do is check to see if a variable is empty. It is basically a list, so it'll delete each item as it does it, so then I need to see if it is empty. I've tried, using if statements, using (@queue == "") and (%null(@queue)), and for some reason they've never worked. Yet, when I reset the variable to "#VAR queue {}", the script works...

The alias I'm using scans the queue to see if anything's there before it does the next thing... Well, it won't do the next thing if it thinks there's something there, yet, when I look, it's empty, I'm just not trying to find an empty value correctly. Any thoughts??

Enchanter Joined: 20 Nov 2002 Posts: 627 Location: USA

#if @name="" {yes} {no}

MASTER Joined: 28 Nov 2000 Posts: 4817 Location: USA

"It is basically a list"
A list is a particular type of zMUD variable. Is it a list or isn't it?
What command do you use to "delete each item"?

I had no problems.
#VAR queue {Item 1|Item2|Third Item}
#AL test1 {#IF (@queue=="") {#SAY test1 = empty} {#SAY test1 = not empty}}
#AL test2 {#IF (%null(@queue)) {#SAY test2 = empty} {#SAY test2 = not empty}}
#AL test3 {#IF (%numitems( @queue) = 0) {#SAY test3 = empty} {#SAY test3 = not empty}}
#DELNITEM queue 1;test1;test2;test3

As expected, all three tests report "not empty" the first two times and "empty" on the third #DELN.

#VAR queue {Item 1|Item2|Third Item}
#DELI queue {%item( @queue, 1)};test1;test2;test3
Same results, not empty on first two deletions and empty on third.

#VAR queue {Item 1|Item2|Third Item}
#VAR queue {%delitem( %item( @queue, 1), @queue)};test1;test2;test3
And the same results again.

You see, no matter what I try I get the expected results. So, without knowing what commands you use, it's impossible to help you.

Novice Joined: 22 Nov 2003 Posts: 34

You could also do a simple:

#IF {@queue} {#SH not empty} {#SH empty}