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


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


Example:

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
   }
}
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