Socketed-calculator server
The problem: "Create a web app (using any programming languages) which logs calculations as they happen and shares those calculations with everyone connected to the website.
For example, user A and user B go to your site at the same time. User A calculates "5 + 5", which equals "10". This is logged below the calculator as "5 + 5 = 10". User B is updated about this calculation right after user A posts it. Now, user B calculates "3 x 4".This calculates to “12” and displays "3 x 4=12" right below the prior calculation. User A sees this update immediately after user B posts it.
Results should remain between sessions. Only show the last 10 calculations descending from most recent to oldest."
65k connections per port are possible using WebSockets. This app can be scaled further by adding mutiple servers, a DB, a load balancer etc. UX can be improved for mobile devices using Reactstrap
Give it a shot at https://socketed-calculator-client.herokuapp.com/