ListXxorY

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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.

See also: Lists


<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"];

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

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

}

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;

}

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-archive.secondlife.com/54/e4/194138/1.html