Flyweight Sample Implementation

fw.js

var Task = function(data) {
    this.flyweight = Flyweight.get(data.project, data.priority, data.user, data.completed);
    this.name = data.name; //this is the only unique property
//    this.priority = data.priority;
//    this.project = data.project;
//    this.user = data.user;
//    this.completed = data.completed;
}

function Flyweight(project, priority, user, completed) {
    this.priority = data.priority;
    this.project = data.project;
    this.user = data.user;
    this.completed = data.completed;
}


var FlyweightFactory = function(){
    var flyweights = {};
    
    var get = function(project, priority, user, completed){
      //get all the things that are not unique
        if (!flyweights[project + priority + user + completed]) {
            flyweights[project + priority + user + completed] = 
                new Flyweight(project, priority, user, completed);
        }
        return flyweights[project + priority + user + completed];
    };
    
    var getCount = function() {
        var count = 0;
        for(var f in flyweights) count++;
        return count;
    }
    
    return {
        get: get,
        getCount : getCount
    };
    
    
}();