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Wizard Joined: 25 Mar 2003 Posts: 1113 Location: USA

I'm trying to make a custom function that will scan one list looking for one or more instances of something in another list. Here's an example:

#VAR list1 {blah1|blah2|blah3}
#VAR list2 {blah1|blah4}
#FUNCTION listcheck {%if( <list2 contains one or more items found in list1> , 1, 0)}

And if blah1 was removed from list2 and it contained only blah4, the function would evaluate to 0.

I've tried a few things in vain and I've found no functions that would allow me to do this inline or very efficiently. I know that I could do this with #LOOP or #FORALL, but I can't use those with #FUNCTION. Can anyone help me find a way to do this?

Apprentice Joined: 03 Mar 2003 Posts: 141

You can use #LOOP #FORALL in functions by using %exec

#FUN listcheck {%if(%exec("#FORALL @list2 {#IF (%ismember(%i,@list1)) {1}}"),1,0)}

%exec returns a list of the results from all of the commands
it executed. So if it didn't find any members that your two lists shared the exec result list would be null and your function would return 0 etc.. So if you need to know how many it found you could change the %if to return the %numitems from the exec result

Cheers, Jesse

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

To generalize the function:
#FUN listcheck {%if( %exec( #FORALL %1 {#IF (%ismember( %i, %2)) {1}}), 1, 0)}

Syntax: @listcheck( list1, list2)
Returns 1 if two stringlists have any members in common. Otherwise, returns 0.