[SDPhantom]

Originally Posted by d87 local t3 = {nil, nil, 4, 7, nil, 4} t3[5]= 2 -- #t3 = 6 t3[7]= 2 -- #t3 = 0 Also, if you try to expand your array, sizearray is recalculated to first boundary it founds.

I've tested this with the following function, sizearray doesn't ever seem to decrease like said.

function tAppend(tbl,...)
--  This should allow unpack() to work with embedded nils as if {...} was used
--  We need to keep the array allocation intact, Lua ignores setting the next index to nil
--  and creates gaps, pouring the next values into the non-array section of the table
    local tlen,previsnil=#tbl,false;
    for i=1,select("#",...) do
        local id,val=tlen+i,select(i,...);
        tbl[id]=val or false;-- Force to an actual value
        if previsnil then tbl[id-1]=nil; end
        previsnil=(val==nil);
    end
    if previsnil then tbl[#tbl]=nil; end
    return tbl;
end

Running the following code allows it to resize the table a few times to give it a chance to recalculate the sizearray value, but the embedded nils are still counting towards the size.

local t=tAppend({},1,nil,nil,4,nil,6,7,8);
print(#t);	-- Prints 8

To make the process better understood, this is the same as the following:

local t={};

t[1]=1;
t[2]=false;
t[3]=false;	t[2]=nil;
t[4]=4;		t[3]=nil;
t[5]=false;
t[6]=6;		t[5]=nil;
t[7]=7;
t[8]=8;

print(#t);	-- Prints 8