Tic-Tac-Toe

Script Code

tictactoe.webscript.io/start

tictactoe.webscript.io/join

tictactoe.webscript.io/move

local pusher = require('pusher')
function getwinner(board)
	local lines = {
		{1,2,3},{4,5,6},{7,8,9},	-- horizontal wins
		{1,4,7},{2,5,8},{3,6,9},	-- vertical wins
		{1,5,9},{3,5,7}						-- diagonal wins
	}
	for i,line in ipairs(lines) do
		local winner = nil
		for i,index in ipairs(line) do
			winner = winner or board[index]
			if board[index] == '' or board[index] ~= winner then
				winner = nil
				break
			end
		end
		if winner ~= nil then
			return winner
		end
	end
	return nil
end
function isfull(board)
	for i,v in ipairs(board) do
		if v == '' then return false end
	end
	return true
end
local state = json.parse(storage['game:'..request.form.id])
local index = tonumber(request.form.index)
if state.turn ~= request.form.player -- not his turn
	or request.form.secret ~= state.players[request.form.player] -- imposter
	or index == nil or index < 1 or index > 9 -- out of range
	or state.board[index] ~= '' then -- already taken
	return 403
else
	state.board[index] = request.form.player
	winner = getwinner(state.board)
	if winner ~= nil then
		state.winner = winner
		state.turn = nil
	elseif isfull(state.board) then
		state.draw = true
		state.turn = nil
	else
		state.turn = ({X='O', O='X'})[request.form.player]
	end
	if state.turn == nil then -- game over
		storage['game:'..request.form.id] = nil
	else
		storage['game:'..request.form.id] = json.stringify(state)
	end
	pusher.send('<pusher app id>', '<pusher auth key>', '<pusher auth secret>',
		request.form.id, 'update', json.stringify(state))
	return 200
end

Try It!

Start a new game:

or join a game: