Forums Scripts & Popups Hash Table Script Help

I was wondering if anyone could provide me with a command Hash Table script that will go through a Hash Table and delete all the Items that don't have no Data in them.

Example

alias NoData {
etc
}

Use /del_nodata htable_name

Thank you for your response. I tested it out but it deletes everything in the Hash Table with or without data in the Item of the Hash Table.

change to

Yeah, forgot one thing, the RusselB's code will work but that's not what should be used, here is the correction :

Thanks guys, works perfectly now, appreciate it.

Would you kindly explain why your code should be used and mine shouldn't, when they both work, and yours actually requires mIRC to do two $hget's as mine only requires one?

I said "should" because the help file state this :I also gave this solution because that what I wanted to use first

I think the "efficient" way the helpfile talks about is accessing item's data with $hget(table,itemname) instead of $hget(table,itemN).data
As the first method is no option here RusselB's method is fine - and, according to a rough bench, slightly faster (~ 25%)

Maybe Khaled will read this topic and feel like clarifying that section of the help file.

It makes no sense to me, that a method that shows ~25% speed increase could be called "inefficient".

Hmmm... RussleB's code looks the hash table up one; wims's twice. Doing two table look ups will take longer than when one is needed... isn't that obvious...

This will look for an ITEM that is null, not data. Russel's code is what was asked for. Am I wrong?


As for the efficiency, I would speculate that using the true item name is more efficient than having mIRC go to the Nth item and display the data.

$hget(table,N).item = name of Nth item
$hget(table,<item>) = data of the item with name <item>
thus:
$hget(table,$hget(table,N).item) == $hget(table,N).data = data of Nth item

Wims' code works - he only avoided using the .data property (due to a a misinterpretation of the abovementioned phrase in the helpfile, I suppose).

lol, i didnt even see the first $hget. I better get some sleep.

It is, but as it is to respect what the mirc help file says, especially on a official forum.
I've not misinterpret the statement, I've just use it.

Just to clarify, the help file means that $hget(table,N).data is not an efficient way of getting the item's data compared to $hget(table,item). That's because the former has to go through the items one by one internally whereas the latter jumps directly to "item" (this is due to how hash tables work - see wikipedia's entry on this for more).

$hget(table,N).item is the same as $hget().data in terms of efficiency: it too has to go through the items. So using $hget(table,$hget(table,N).item) is no more efficient than $hget(table,N).data - in fact it is slightly slower due to the extra $hget().

As implied before in this thread, you do need to go through items without knowing their names, so the fast way of accessing the hash table ($hget(table,item)) is not applicable here: one has to use either .item or .data.