How to add private variable to this Javascript object literal snippet?

Question

Found this at MDC but how if I\'d wanted to add a private variable to the

var dataset = {
    tables:{
        customers:{
            cols:[ /*here*/ ],
            


        

Answer 1

Private variables in javascript are done using the var keyword inside a closure. Only priviliged methods and attributes can access it. Here's the way to do it:

function dataset()
{
var private_stuff = 10; // private
this.foo = new function() { alert(private_stuff); } // priviliged
return {
    tables:{
        customers:{
                cols:[  ],
                rows:[  ]
        },
        orders:{
                cols:[  ],
                rows:[  ]
        }
    },
    relations:{
        0:{
                parent:'customers', 
                child:'orders', 
                keyparent:'custid', 
                keychild:'orderid',
                onetomany:true
        }
    }
}; // public
}

var d = new dataset;
alert(d.foo());