vector-clock.js

var Clock = function(id){
  this.id = id;
  this.clock = {};
  this.clock[this.id] = 0;
};

Clock.prototype.get = function() { return data; };

Clock.prototype.update = function(data, send) {
  this.clock[this.id]++;
  this.data = data;
  send({data: data, clock: this.clock});
};

Clock.prototype.recv = function(resp, conflict) {
  // check to see if our last update was concurrent with this one
  var gt = false, lt = false;
  keys.forEach(function(k){
    if(this.clock[k] > (resp.clock[k] || 0))
      gt = true;
    else
      lt = true;
  }.bind(this));

  if(gt && lt) {
    this.data = conflict(this.data, resp.data);
  } else {
    this.data = resp.data;
  }
  
  this.clock[this.id]++;
  var keys = Object.keys(resp.clock);
  // merge clocks
  keys.forEach(function(k){
    if(resp.clock[k] > (this.clock[k] || 0))
      this.clock[k] = resp.clock[k];
  }.bind(this));
};