What's the difference between io.sockets.emit and broadcast?


Question

What's the difference between io.sockets.emit and socket.broadcast.emit? Is it only that broadcast emits to everyone BUT the socket that sends it?

It seems like they can be used interchangeably:

io.sockets.on('connection', function (socket) {
  //these should do the same thing  
  io.sockets.emit('this', { receivers: 'everyone'});

  socket.broadcast.emit('this', { receivers: 'everyone but socket'}); //emits to everyone but socket
  socket.emit('this', { receivers: 'socket'}); //emits to socket
});
1
91
9/10/2017 6:12:51 AM

Accepted Answer

io.sockets.emit will send to all the clients

socket.broadcast.emit will send the message to all the other clients except the newly created connection

This Socket.IO Wiki post will help everyone reading this question:

162
12/20/2014 9:28:38 AM

socket.broadcast.emit() behaves similar to io.sockets.emit, but instead of emitting to all connected sockets it will emit to all connected socket except the one it is being called on. So in this case the socket referenced by socket will not receive the event.


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