Delete JSON data in array

Question

I am trying to remove a piece of a data from a JSON array. For example, I have this array;

var users = [];
io.on('connection',function(socket){
   socket.on('nickname', function(nick){
      socket.nick = nick;
       users.push({
         user:socket.nick,
         userid:socket.id,
         socket:socket
       });
    });

I am trying to delete in users this way;

socket.on('disconnect', function(){
    delete users[{
        user,
        userid,
        socket
    }];
   });
 });

How can I do that?

are you trying to delete a specific user, or the whole array? — zfrisch
– zfrisch, Commented Jul 25, 2017 at 18:41
Do you want to delete the whole users array or only a specific object in it? — Sourav
– Sourav, Commented Jul 25, 2017 at 18:42
Each connected user has its own nickname and id on that page.Disconnected user will be deleted in users array. — Ömer Faruk Arslan
– Ömer Faruk Arslan, Commented Jul 25, 2017 at 18:46

Sourav · Accepted Answer · 2017-07-25 18:56:12Z

3

You may try using lodash methods to achieve what you are trying to: -

var _ = require('lodash');
socket.on('disconnect', function(){
        _.pullAllWith(users, [{
             user:socket.nick,
             userid:socket.id,
             socket:socket
             }], _.isEqual)
       });
     });

see if this works..

answered Jul 25, 2017 at 18:56

Sourav

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Comments

Woodrow · Accepted Answer · 2017-07-25 18:52:15Z

0

If you know the values of each of the properties of each user object, you could pass the values into a function and loop through the the users array to find a matching object and then splice it from the array (updated answer to pass in object to function):

var users = [];
for (var i = 1; i < 10; i++) {
  users.push({
    user: i,
    userId: i,
    socket: i
  });
}

/**
 * Loop through the users array to find matching 
 * object to remove
 **/
var deleteUser = function(userToDelete) {
  for (var userObj in users) {
    var userObject = users[userObj];
    if (typeof userObject === "object" &&
      userObject.user === userToDelete.user &&
      userObject.userId === userToDelete.userId &&
      userObject.socket === userToDelete.socket) {
      users.splice(userObj, 1);
      break;
    }
  }
  console.log(users);
};

deleteUser({
  user: 2,
  userId: 2,
  socket: 2
});

edited Jul 25, 2017 at 18:52

answered Jul 25, 2017 at 18:47

Woodrow

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2 Comments

Ömer Faruk Arslan Over a year ago

Each connected user has its own nickname and id on that page.Disconnected user will be deleted in users array.İts not a static like 1 or 2 .

Woodrow Over a year ago

No, I know it's not a static. I just did the "i" count to have an example users array for you to see.

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