# ListXorY

 LSL Portal

## Function: list ListXorY(list lx, list ly);

Join two lists to make one new combined list, while also eliminating any resulting duplicates in the new list.

<lsl> list ListXorY(list lx, list ly){ // add the lists eliminating duplicates

list lz = []; integer x;
for (x = 0; x < llGetListLength(ly); ++x){
if (~llListFindList(lx,llList2List(ly,x,x))){
;
}
else {
lz = lz + llList2List(ly,x,x);
}
}
return lx + lz;

} </lsl>

Example:

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

list ListXorY(list lx, list ly){ // add the lists eliminating duplicates

list lz = []; integer x;
for (x = 0; x < llGetListLength(ly); ++x){
if (~llListFindList(lx,llList2List(ly,x,x))){
;
}
else {
lz = lz + llList2List(ly,x,x);
}
}
return lx + lz;

}

default{

state_entry() {
llSay(0, "The new combined list is: " + llList2CSV(ListXorY(l1,l2)) );
//will say: a, b, c, 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