ListFindListReverse

Summary

User-Defined Function: integer uListFindListReverse( list vLstSrc, list vLstTst );

Returns an integer index of the last instance of vLstTst in vLstSrc

• vLstSrc: source list to check
• vLstTst: list to look for

if vLstTst is not found in vLstSrc -1 is returned.
the index of the first element in vLstSrc is 0

Code:

• LSO: 168 Bytes
• MONO: 512 Bytes

integer uListFindListReverse( list vLstSrc, list vLstTst ){
    integer vIntRtn;
    if (vLstTst != []){
        integer vIntPst = (vLstSrc != []);
        while ((vIntRtn -= ~llListFindList( llList2List( vLstSrc, vIntRtn, vIntPst), vLstTst )) ^ vIntRtn );
    }
    return ~-vIntRtn;
}
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Notes

• function loops n+1 times (where n = number of instances of vLstTst in vLstSrc).
  • this may make it slow for large lists containing many copies of vLstTst
• Unlike llListFindList, this function properly returns -1 if either vLstSrc or vLstTst is an empty list([]).