ListXxorY

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

Returns a new list, composed of elements that were in either original script, but not both.

Note: This is not the same as getting rid duplicates by preserving just one of each duplicated item. It goes further, and removes both items.

<lsl> list ListXxorY(list lx, list ly) { // return elements that are in X or Y but not both

   return ListXnotY( lx, ly) + ListXnotY( ly, lx);

} </lsl>

Example:

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

default{

  state_entry() {
     llSay(0, "Elements that are in x list or y list but not both: " + llList2CSV(ListXxorY(l1,l2)));
     //will say: d, 1, 2, 3
  }

} </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