The getJSON method seems to ignore the normal rules of scoping within JavaScript.

Given code such as this...

someObject = {
    someMethod
: function(){
        
var foo;

        $

.getJSON('http://www.somewhere.com/some_resource', function(data){
            foo 
= data.bar;
        
});

        alert

(foo); // undefined
    
}
}

someObject.someMethod();

Is there a best practice for accessing the value of the variable outside of the getJSON scope?