Add an onMany method to attach a callback to multiple socket events.

[zoosphar]

When emitting multiple events of a similar functionality from the server, One has to apply a 'socket.on' listener to each one of them. Rather than what will be feasible is to have an onMany method which will take in an array of all the expected events and then fire the callback if any of the event is being emitted from the server.

[darrachequesne]

Hi! This should be sufficient:

function onMany(socket, events, handler) {
  events.forEach(e => {
    socket.on(e, handler);
  });
}

onMany(socket, ["foo", "bar"], () => { /* ... */ });

What do you think?

[zoosphar]

Hi! This should be sufficient:

function onMany(socket, events, handler) {
  events.forEach(e => {
    socket.on(e, handler);
  });
}

onMany(socket, ["foo", "bar"], () => { /* ... */ });

What do you think?

I identified some potential issues with the solution you proposed

1. If there are duplicate values in the array, this can lead to a socket listening to the same event multiple times.
2. Another potential concern is that if the handler function is stateful (e.g., contains closure variables or relies on an external state), it might behave unexpectedly due to being reused for multiple event listeners.