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var fred = {
  user_code : "FE923"
}
var john = {
	user_code : "AZ093"
}
var dave = {
	user_code : "FE923"
}

function Conversation() {
	var members = [];
	var add_member = function(m){
		members.push(m.user_code);
		members.sort();
	}
	var get_id = function(){
		return members.join("|");
	}
	 
	return{
		add_member:add_member,
		get_id:get_id
	}
}

var conv_one = new Conversation();
conv_one.add_member(fred);
conv_one.add_member(john);

var conv_one_id = conv_one.get_id();
console.log(conv_one_id);