Should I use off with Angular?

[El-Tommy]

I have an Angular application where every time a controller is executed, it executes a new socket.on to be able to update its internal variables when the server triggers an event.
It turns out that if I exit the controller and the event configured in the original socket.on is triggered by the server, that event will be reexecuted (tests performed with console.log within the executed function).

Is the best procedure to run socket.off? If so, could this cause performance issues on the server?

[jokester]

Is the best procedure to run socket.off

For event handlers and similar things (subscriptions etc) registered in a component of app, the right thing is almost always to release them in time. If a subscription outlives a component, its initialization could be moved elsewhere.

could this cause performance issues on the server

I guess not. All should happen in browser , unless they triggered something that in turn adds to server's work.