Question

I’d like to be able to do something like

foo.x = 7;

And then do something to make that property read only so that no other code can change it. IE i’d like

foo.x = 10; //should do nothing

To do nothing is there anyway to do that in JS?

Answer 1

With ECMAScript5 you can achieve that:

var foo = {};

Object.defineProperty(foo, 'x', {
    value: 7,
    writable: false,
    configurable: false,
    enumerable: true
});

You might want to check out MDN JavaScript for ECMAScript5 stuff.