socket emit vs socket send

Question

What s the difference between these two   I noticed that if I changed from socket emit to socket send in a working program  the server failed to receive the message  although I don t understand why   I also noticed that in my program if I changed from socket emit to socket send  the server receives a message  but it seems to receive it multiple times  When I use console log   to see what the server received  it shows something different from when I use socket emit   Why this behavior  How do you know when to use socket emit or socket send

User · Answer

Simple and precise  Source  Socket IO google group    socket emit allows you to emit custom events on the server and client  socket send sends messages which are received with the  message  event

User · Answer

https   socket io docs client-api  socket-send-args-ack  socket send    Sends a message event  socket emit eventName      args    ack      you can custom eventName

User · Answer

socket send is implemented for compatibility with vanilla WebSocket interface  socket emit is feature of Socket IO only  They both do the same  but socket emit is a bit more convenient in handling messages

User · Answer

With socket emit you can register custom event like that   server   var io   require  socket io   listen 80    io sockets on  connection   function  socket      socket emit  news     hello   world        socket on  my other event   function  data        console log data               client   var socket   io connect  http   localhost    socket on  news   function  data      console log data     socket emit  my other event     my   data            Socket send does the same  but you don t register to  news  but to message   server   var io   require  socket io   listen 80    io sockets on  connection   function  socket      socket send  hi          client   var socket   io connect  http   localhost    socket on  message   function  message      console log message

User · Answer

In basic two way communication systems  socket emit has proved to be more convincing and easy to use  personal experience  and is a part of Socket IO which is primarily built for such purposes

User · Answer

TL DR   socket send data  callback  is essentially equivalent to calling socket emit  message   JSON stringify data   callback   Without looking at the source code  I would assume that the send function is more efficient edit  for sending string messages  at least    So yeah basically emit allows you to send objects  which is very handy   Take this example with socket emit   sendMessage  function type  message        socket emit  message             type  type          message  message             and for those keeping score at home  here is what it looks like using socket send   sendMessage  function type  message        socket send JSON stringify           type  type          message  message

[sockets] socket.emit() vs. socket.send()

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