ListUnique

Function: list ListUnique(list lAll);

Given a list of elements, strips out any duplicates in that list, and returns the de-duped list.

See also: Lists

list ListUnique( list lAll ) {
    integer i;
    list lFiltered = llList2List(lAll, 0, 0);
    integer iAll = llGetListLength( lAll );
    for (i = 1; i < iAll; ++i) {
        if ( llListFindList(lFiltered, llList2List(lAll, i, i) ) == -1 ) {
            lFiltered += llList2List(lAll, i, i);
        }
    }
    return lFiltered;
}

Example:

list mylist = ListUnique(["A", "A", "B", "C", "C", "B"])

would return the list:

["A", "B", "C"]

Originated in a November 2004 thread led by Chromal Brodsky in the SL Scripting Forum. http://forums-archive.secondlife.com/54/30/28137/1.html

A *possibly* faster replacement (at least in my experiments in removing duplicate Agent UUIDs from multiple scanners on a sim):

list nvStripDupes(list DupedList)
{
    integer pos;
    list Element;
    while (llGetListLength(DupedList) != 0)
    {
        Element = llList2List(DupedList, 0, 0);
        NoDupes += Element;
        pos = llListFindList(DupedList, Element);
        while ( pos != -1)
        {
            DupedList = llDeleteSubList(DupedList, pos, pos);
            pos = llListFindList(DupedList, Element);
        }
    }
    return NoDupes;
}