-- assign empty string to str
set str to ""


-- check if string is empty
if str is "" then
	-- str is empty
end if
-- or
if id of str is {} then
	-- str is empty
end if
-- or
if (count of str) is 0 then
	-- str is empty
end if


-- check if string is not empty
if str is not "" then
	-- string is not empty
end if
-- or
if id of str is not {} then
	-- str is not empty
end if
-- or
if (count of str) is not 0 then
	-- str is not empty
end if