store.js

/* implements a non-persistent store in memory */

module.exports = function(){
    
    var fields = new Array();
    
    this.get = function(field, id, callback){
        //Parsing arguments
        if(typeof(callback) == 'undefined'){ callback = function(){}; }
        
        if(typeof(id) == 'function'){
            id(fields[field]);  //id is the callback
        }
        if(typeof(id) == 'undefined'){
            callback(fields[field]);
        }
        
        if(hasField(field)){
            callback(fields[field][id]);
        } else {
            callback(null);
        }
    }
    
    this.put = function(field, value, callback){
        if(!hasField(field))
            fields[field] = new Array();
            
        fields[field].push(value);
        if(typeof(callback) === 'function')
            callback(fields[field].length - 1);
    }

    this.set = function(field, id, value, callback){
        if(!hasField(field))
            fields[field] = new Array();
        
        fields[field][id] = value;
        
        if(typeof(callback) === 'function')
            callback();
    }

    this.destroy = function(field, id, callback){
        if(hasField(field)){
            if(fields[field].length == 1 && id in fields[field]){
                delete fields[field];
            } else {
                fields[field].splice(id, 1);
            }
        }
        
        if(typeof(callback) === 'function')
            callback();
    }
    
    function hasField(field){
        return typeof(fields[field]) !== 'undefined';
    }
};