Difference between revisions of "ListXnotY"

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(You should initialize the variable when you declare it, as the compiler will implicitly initialize it. Implicit initialization isn't as readable as explicit, which is what examples should be: readable)
Line 13: Line 13:
     integer n = llGetListLength(lx);
     integer n = llGetListLength(lx);
     for (; i < n; i++)
     for (; i < n; i++)
    {
         if (llListFindList(ly,llList2List(lx,i,i)) == -1)
         if (llListFindList(ly,llList2List(lx,i,i)) == -1)
        lz = lz + llList2List(lx,i,i);
            lz += llList2List(lx,i,i);
    }
     return lz;
     return lz;
}
}

Revision as of 10:53, 12 January 2010

Function: list ListXnotY(list lx, list ly);

Show what x list has that y list is missing.

See also: Lists

<lsl> list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list

   list lz = [];
   integer i = 0;
   integer n = llGetListLength(lx);
   for (; i < n; i++)
       if (llListFindList(ly,llList2List(lx,i,i)) == -1)
           lz += llList2List(lx,i,i);
   return lz;

}

</lsl>


Example:

<lsl> list l1 = ["a","b","c","d"]; list l2 = ["a","1","b","2","c","3"];

default{

  state_entry() {
     llSay(0, "X list has this in it, but Y list doesn't: " + llList2CSV(ListXnotY(l1,l2)) );
     //will say: d
  }

} </lsl>

Posted with the kind permission of Very Keynes, who originated this script June 2007 in the SL scripters forum http://forums.secondlife.com/showthread.php?t=194138