Question

Socket.io recommends settings per-socket variables like so:

socket.set('foo', bar, function () {});

Variables can also be set and accessed on the socket:

socket.foo = bar

Is there a benefit to using the provided set() function?

Answer 1

Calling socket.foo sets your property on the socket object itself. This isn’t recommended because you could be overriding an internal property that socket uses and depends upon. When you call socket.set() this is stored in an internal data structure that won’t clash with internal properties.

https://github.com/LearnBoost/socket.io/blob/master/lib/socket.js#L246

Socket.prototype.set = function (key, value, fn) {
  this.store.set(key, value, fn);
  return this;
};