ListXnotY

Show what x list has that y list is missing.

See also: Lists

 
list ListXnotY(list lx, list ly) {// return elements in X list that are not in Y list
    list lz = [];
    integer x;
    for (x = 0; x < llGetListLength(lx); x++) {
        if (~llListFindList(ly,llList2List(lx,x,x))) {
            ;
        }
        else {
            lz = lz + llList2List(lx,x,x);
        }
    }
    return lz;
}
 

Example:

 
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
   }
}