How to use the aerospike.operator function in aerospike

function updateTweetCount(client, username)  {
  var userKey = aerospike.key('test','users',username); 
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, bins, metadata, key) {
    if ( err.code === 0 ) {
      // console.log('INFO: The tweet count now is: ' + bins.tweetcount);
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });  
}

function updateTweetCount(client, username)  {
  var userKey = aerospike.key('test','users',username); 
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, bins, metadata, key) {
    if ( err.code === 0 ) {
      // console.log('INFO: The tweet count now is: ' + bins.tweetcount);
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });  
}

function updateTweetCount(client, username)  {
  var userKey = aerospike.key('test','users',username); 
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, bins, metadata, key) {
    if ( err.code === 0 ) {
      // console.log('INFO: The tweet count now is: ' + bins.tweetcount);
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });  
}

function updateTweetCount(client, username)  {
  var userKey = aerospike.key('test','users',username); 
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, bins, metadata, key) {
    if ( err.code === 0 ) {
      // console.log('INFO: The tweet count now is: ' + bins.tweetcount);
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });  
}

function updateUserUsingOperate(client, user_key, ts) {
  // Update User record
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.write('lasttweeted', ts),operator.read('tweetcount')];
  client.operate(user_key, operations, function(err, bins, metadata, key) {
    // Check for errors
    if ( err.code === 0 ) {
      console.log("INFO: The tweet count now is: " + bins.tweetcount);
    }
    else {
      console.log("ERROR: User record not updated!");
      console.log(err);
    }
  });
}

function updateUserUsingOperate(client, user_key, ts, callback) {
  // Update User record
  // User Operate() to set and get tweetcount
  // Exercise K6
  var operator = aerospike.operator;
  //TODO ...var operations = [ ...  ];
  //TODO ...client.operate(
  //  callback();
  //});
}

function updateTweetCount(client, username)  {  //fire and forget!
  var userKey = aerospike.key('test','users',username);
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, record, metadata, key) {
    if ( err == null ) {
      console.log('INFO: Updated tweet count is: ' + record.tweetcount);
      //we don't need to tie anything to return of this callback. (fire and forget)
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });
}

function updateTweetCount(client, username)  {  //fire and forget!
  var userKey = aerospike.key('test','users',username);
  var operator = aerospike.operator;
  var operations = [operator.incr('tweetcount', 1),operator.read('tweetcount')];
  client.operate(userKey, operations, function(err, record, metadata, key) {
    if ( err == null ) {
      console.log('INFO: Updated tweet count is: ' + record.tweetcount);
      //we don't need to tie anything to return of this callback. (fire and forget)
    }
    else  {
      console.log('ERROR: updateTweetCount failed:\n', err);
    }
  });
}