fooooo.bar.js

(function(){

    var foo = {
        count: 0,
        bar: function(it){
            this.count++;
        }
    };
    
    var bar = "bar";
    
    foo['bar']("baz");
    foo.bar("baz");
    foo[bar]("baz");

    if(foo.count !== 3){
        alert('if this is true, the universe imploded');
    }
    
})();