inadvisably late-night js message passing

message.js

function NoMethodError(method) {
    this.name = "NoMethodError";
    this.message = method + " is not defined";
}
NoMethodError.prototype = Error.prototype;

Object.prototype.methodMissing = function(method,args) {
  throw new NoMethodError(method)
}

Object.prototype.send = function(message) {
  var args = [].slice.call(arguments,1);
  if(this[message]) 
    this[message].apply(this,args)
  else
    this.methodMissing(message,args)
}

var userList = {
      _name: "Online users",
      _displayedUser: {},
      "displayedUser=": function(who) {
        if(this.isValid(who)) this._displayedUser = who;
      },
      isValid: function(user) {
        return user.age > 18;
      },
      "<=>": function(list) {
        var diff = this.length - list.length;
        return diff === 0 ? 0 : diff < 0 ? -1 : 1;
      }
    },
    tim = {
      age: 23
    };

// src: userList.displayedUser = tim
userList.send("displayedUser=",tim);
userList.send("name=","Who is online now");
// src: userList > otherList
// userList.send(">",otherlist);