-- This is to show one of the gotchas around null values in tables.

-- if a table contains a null, then that is the end of the array like properties.

-- {"a",null,"b"} when used with ipairs will only be able to access "a" as the second

-- element is null.

-- This shows how to return something, even a blank table, to preserve the table order

local function elem(show)

if show then

return div{"table was returned"}

else

return {}

end

end

local function nullElem(show)

if show then

return div{"optional table was returned"}

end

end

return function()

return div{

elem(true),

elem(false),

elem(true),

elem(false),

-- other option is to always put the optional content with in its own table

-- this preserves the table iteration order

{null},

{nullElem(false)},

{nullElem(true)}

}

end