Simple lua string generator

String Generator.lua

function rand_str(len)
	len = tonumber(len) or 1
	
	local function rand_char()
		return math.random() > 0.5 
			and string.char(math.random(65, 90))
			or string.char(math.random(97, 122))
	end
	local function rand_num()
		return string.char(math.random(48, 57))
	end
	
	local str = ""
	for i = 1, len do
		str = str .. (math.random() > 0.5 and rand_char() or rand_num())
	end
	return str
end

--print(rand_str(10)) => 10 random alphanumeric characters

Just importing old pastebin scripts to my gist