ListXnotY

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