llGetListLength
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Summary
Function: integer llGetListLength( list src );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns an integer that is the number of elements in the list src.
| • list | src |
Caveats
When using list length to help you loop through a list, it is better to determine the length first, then start your loop:
<lsl> integer i = 0; integer length = llGetListLength(mylist); for (; i < length; ++i) {
llSay(0, llList2String(mylist, i));
} </lsl>
The example below which calculates length in the "for" loop is inefficient because length gets recalculated at each pass through the loop (so, to be clear, do it the above way instead.)
<lsl> integer i; for (i = 0; i < llGetListLength(mylist); ++i) {
llSay(0, llList2String(mylist, i));
} </lsl>
Examples
<lsl> default {
state_entry()
{
list l = ["one", "two", "three"];
integer i = llGetListLength(l);
llOwnerSay("there are " + (string)i + " entries in the list");
}
}
</lsl>Notes
A faster and lighter (in bytecode) way to determine the length of a list is to do a not-equals compare with a null list. This works because the list not-equals compare returns the difference between the lengths. <lsl> list in; integer len_in = llGetListLength(in); integer flen_in = (in != []); //flen_in and len_in will be the same
integer neg_len_in = -llGetListLength(in); integer fneg_len_in = ([] != in); //fneg_len_in and neg_len_in will be the same </lsl>
See Also
Functions
| • | llListStatistics | – | LIST_STAT_NUM_COUNT – Returns the number of integers and floats in the list | |
| • | llStringLength | – | Returns the number of characters in a string. |
Deep Notes
Source
'linden\indra\lscript\lscript_library\lscript_alloc.cpp' @ lsa_cmp_lists
'linden\indra\lscript\lscript_execute\lscript_execute.cpp' @ list_list_operation
Signature |
|---|
function integer llGetListLength( list src ); |