Web versions's in JavaScript. Native version uses a C++ shared codebase, with Objective C and Java native hooks for the platform.
The server uses Node and SocketIO, with the client side JavaScript handling the multiplayer communication logic, which is ran in a headless browser in the native applications.
Future plans are to replace more parts of the performance insensitive native codebase with the JavaScript equivalent.
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What language?
Web versions's in JavaScript. Native version uses a C++ shared codebase, with Objective C and Java native hooks for the platform.
The server uses Node and SocketIO, with the client side JavaScript handling the multiplayer communication logic, which is ran in a headless browser in the native applications.
Future plans are to replace more parts of the performance insensitive native codebase with the JavaScript equivalent.
I did a talk about the architecture last month at Velocity. I haven't gotten round to doing a write up on the contents of the slides yet, however you can access them here: http://cdn.oreillystatic.com/en/assets/1/event/88/Web%20_%20...
Let me know if you'd like me to do one.